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Good First Issue curates easy pickings from popular open-source projects, and helps you make your first contribution to open-source.

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phpmd / phpmd
PHPMD is a spin-off project of PHP Depend and aims to be a PHP equivalent of the well known Java tool PMD. PHPMD can be seen as an user friendly frontend application for the raw metrics stream measured by PHP Depend.
lang: php
stars: 1.77K
last activity: Sep 18, 2020
StackStorm / st2
StackStorm (aka "IFTTT for Ops") is event-driven automation for auto-remediation, security responses, troubleshooting, deployments, and more. Includes rules engine, workflow, 160 integration packs with 6000+ actions (see https://exchange.stackstorm.org) and ChatOps. Installer at https://docs.stackstorm.com/install/index.html. Questions? https://forum.stackstorm.com/.
lang: python
stars: 3.96K
last activity: Sep 16, 2020
STVIR / pysot
SenseTime Research platform for single object tracking, implementing algorithms like SiamRPN and SiamMask.
lang: python
stars: 3.44K
last activity: Sep 17, 2020
Open source text annotation tool for machine learning practitioner.
lang: python
stars: 3.57K
last activity: Sep 17, 2020
dephell / dephell
📦 🔥 Python project management. Manage packages: convert between formats, lock, install, resolve, isolate, test, build graph, show outdated, audit. Manage venvs, build package, bump version.
lang: python
stars: 1.52K
last activity: Sep 17, 2020
Sitespeed.io is an open source tool that helps you monitor, analyze and optimize your website speed and performance, based on performance best practices advices from the coach and collecting browser metrics using the Navigation Timing API, User Timings and Visual Metrics (FirstVisualChange, SpeedIndex & LastVisualChange).
lang: javascript
stars: 3.95K
last activity: Sep 18, 2020
A CMS framework for Node.js that supports in-context editing, schema-driven content types, flexible widgets, and much more. Hint: start with the docs and use apostrophe-cli.
lang: javascript
stars: 3.28K
last activity: Sep 18, 2020
The Official Twilio SendGrid Led, Community Driven PHP API Library
lang: php
stars: 1.2K
last activity: Sep 15, 2020
Kubernetes-based, scale-to-zero, request-driven compute
lang: go
stars: 3.24K
last activity: Sep 18, 2020
A modern Python test framework designed to help you find and fix flaws faster.
lang: python
stars: 317
last activity: Sep 16, 2020
General purpose plain text editor for macOS. Widely known for its live collaboration feature.
lang: objective-c
stars: 1.09K
last activity: Sep 17, 2020
Pterodactyl is an open-source game server management panel built with PHP 7, React, and Go. Designed with security in mind, Pterodactyl runs all game servers in isolated Docker containers while exposing a beautiful and intuitive UI to end users.
lang: php
stars: 1.92K
last activity: Sep 18, 2020
Collaborative forensic timeline analysis
lang: python
stars: 1.38K
last activity: Sep 17, 2020
magento / magento2
All Submissions you make to Magento Inc. ("Magento") through GitHub are subject to the following terms and conditions: (1) You grant Magento a perpetual, worldwide, non-exclusive, no charge, royalty free, irrevocable license under your applicable copyrights and patents to reproduce, prepare derivative works of, display, publically perform, sublicense and distribute any feedback, ideas, code, or other information (“Submission") you submit through GitHub. (2) Your Submission is an original work of authorship and you are the owner or are legally entitled to grant the license stated above. (3) You agree to the Contributor License Agreement found here: https://github.com/magento/magento2/blob/master/CONTRIBUTOR_LICENSE_AGREEMENT.html
lang: php
stars: 8.96K
last activity: Sep 18, 2020
sympy / sympy
A computer algebra system written in pure Python
lang: python
stars: 7.35K
last activity: Sep 18, 2020
A browser extension that encrypts your communications with many websites that offer HTTPS but still allow unencrypted connections.
lang: javascript
stars: 2.94K
last activity: Sep 17, 2020
An Open Source Machine Learning Framework for Everyone
lang: c++
stars: 148.48K
last activity: Sep 18, 2020
Electron website
lang: handlebars
stars: 1.25K
last activity: Sep 17, 2020
The Modern And Developer Centric Python Web Framework. Be sure to read the documentation and join the Slack channel questions: http://slack.masoniteproject.com
lang: python
stars: 1.44K
last activity: Sep 16, 2020
A work-in-progress Google like login example using vuetify
lang: vue
stars: 1
last activity: Aug 6, 2020
OpenGrok is a fast and usable source code search and cross reference engine, written in Java
lang: java
stars: 3.04K
last activity: Sep 18, 2020
A distributed, fast open-source graph database featuring horizontal scalability and high availability
lang: c++
stars: 4.29K
last activity: Sep 18, 2020
Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET developers.
lang: c#
stars: 2.27K
last activity: Sep 17, 2020
winsw / winsw
A wrapper executable that can run any executable as a Windows service, in a permissive license.
lang: c#
stars: 4.61K
last activity: Sep 17, 2020
🧰 The Rust SQL Toolkit. An async, pure Rust SQL crate featuring compile-time checked queries without a DSL. Supports PostgreSQL, MySQL, and SQLite.
lang: rust
stars: 2.61K
last activity: Sep 18, 2020
crate / crate
CrateDB is a distributed SQL database that makes it simple to store and analyze massive amounts of machine data in real-time.
lang: java
stars: 2.81K
last activity: Sep 18, 2020
👽 A free, fast and beautiful API request builder used by 75k+ developers. https://hoppscotch.io
lang: vue
stars: 23.56K
last activity: Sep 18, 2020
lando / lando
A local development and DevOps tool for all your projects that is fast, easy, powerful and liberating
lang: javascript
stars: 2.48K
last activity: Sep 18, 2020
Dolibarr ERP CRM is a modern software package to manage your company or foundation activity (contacts, suppliers, invoices, orders, stocks, agenda, accounting, ...).It's opensource software (wrote with PHP language) designed for small and medium companies, foundation and freelances. You can freely install, use and distribute it as a standalone application or as a web application to use it from every internet access and media.
lang: php
stars: 2.05K
last activity: Sep 18, 2020
artalar / reatom
State manager with a focus of all needs
lang: typescript
stars: 483
last activity: Sep 17, 2020
The Creative Commons Catalog API allows programmatic access to search for CC-licensed and public domain digital media.
lang: python
stars: 79
last activity: Sep 16, 2020
yewstack / yew
Rust / Wasm framework for building client web apps
lang: rust
stars: 13.29K
last activity: Sep 18, 2020
AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.
lang: c#
stars: 2.04K
last activity: Sep 16, 2020
A fast, scalable, high performance Gradient Boosting on Decision Trees library, used for ranking, classification, regression and other machine learning tasks for Python, R, Java, C++. Supports computation on CPU and GPU.
lang: c++
stars: 5.38K
last activity: Sep 18, 2020
babel / babel
🐠 Babel is a compiler for writing next generation JavaScript.
lang: javascript
stars: 37.43K
last activity: Sep 18, 2020
rclone / rclone
"rsync for cloud storage" - Google Drive, Amazon Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Cloudfiles, Google Cloud Storage, Yandex Files
lang: go
stars: 23.38K
last activity: Sep 18, 2020
The Atomic Game Engine is a multi-platform 2D and 3D engine with a consistent API in C++, C#, JavaScript, and TypeScript
lang: c++
stars: 2.33K
last activity: Sep 16, 2020
corda / corda
Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.
lang: kotlin
stars: 3.39K
last activity: Sep 17, 2020
A cross platform, self-hosted server compatible with Bitpay API
lang: c#
stars: 1.61K
last activity: Sep 18, 2020
GLPI is a Free Asset and IT Management Software package, Data center management, ITIL Service Desk, licenses tracking and software auditing.
lang: php
stars: 1.82K
last activity: Sep 17, 2020
GitHub Classroom automates repository creation and access control, making it easy for teachers to distribute starter code and collect assignments on GitHub.
lang: ruby
stars: 1.22K
last activity: Sep 15, 2020
ray-project / ray
An open source framework that provides a simple, universal API for building distributed applications. Ray is packaged with RLlib, a scalable reinforcement learning library, and Tune, a scalable hyperparameter tuning library.
lang: python
stars: 13.1K
last activity: Sep 18, 2020
A platform that allows you to chat with someone without any registration. You don't need to identify yourself to the internet and can chat anonymously. The end-users are not traceable and data is not owned by anyone.
lang: javascript
stars: 39
last activity: Sep 18, 2020
An alternative side effect model for Redux apps
lang: javascript
stars: 20.85K
last activity: Sep 18, 2020
💄 Universal beautification package for Atom editor (⚠ Currently migrating to https://github.com/Unibeautify/ and have very limited bandwidth for Atom-Beautify Issues. Thank you for your patience and understanding :heart: )
lang: coffeescript
stars: 1.46K
last activity: Sep 17, 2020
mavoweb / mavo
Create web applications entirely by writing HTML and CSS!
lang: javascript
stars: 2.45K
last activity: Sep 16, 2020
Plume-org / Plume
Federated blogging application, thanks to ActivityPub (now on https://git.joinplu.me/ — this is just a mirror)
lang: rust
stars: 1.34K
last activity: Sep 16, 2020
This is an example that how to use Markdown creating a dungeon
lang: javascript
stars: 19
last activity: Sep 14, 2020
pyro-ppl / pyro
Deep universal probabilistic programming with Python and PyTorch
lang: python
stars: 6.47K
last activity: Sep 17, 2020
The Blockstack Browser
lang: javascript
stars: 1.11K
last activity: Sep 18, 2020
ssbc / patchwork
A decentralized messaging and sharing app built on top of Secure Scuttlebutt (SSB).
lang: javascript
stars: 3.12K
last activity: Sep 17, 2020
yanganto / s3rs
An S3 Rich Support client
lang: rust
stars: 22
last activity: Aug 18, 2020
lang: java
stars: 2
last activity: Jun 10, 2020
Modeling language for Mathematical Optimization (linear, mixed-integer, conic, semidefinite, nonlinear)
lang: julia
stars: 1.24K
last activity: Sep 17, 2020
Free and Open Source Ecommerce Shopping Cart solution based on ASP.NET CORE and MongoDB
lang: c#
stars: 1.35K
last activity: Sep 17, 2020
VSCodeVim / Vim
:star: Vim for Visual Studio Code
lang: typescript
stars: 7.87K
last activity: Sep 18, 2020
boa-dev / boa
Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.
lang: rust
stars: 1.33K
last activity: Sep 17, 2020
getzola / zola
A fast static site generator in a single binary with everything built-in. https://www.getzola.org
lang: rust
stars: 4.15K
last activity: Sep 18, 2020
Apify SDK — The scalable web crawling and scraping library for JavaScript/Node.js. Enables development of data extraction and web automation jobs (not only) with headless Chrome and Puppeteer.
lang: javascript
stars: 2.53K
last activity: Sep 18, 2020
Free README editing+feedback to make your open-source projects grow. See the README maturity model to help you keep going.
lang:
stars: 1.06K
last activity: Sep 17, 2020
coq / coq
Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.
lang: ocaml
stars: 2.98K
last activity: Sep 17, 2020
📦 Workbox: JavaScript libraries for Progressive Web Apps
lang: javascript
stars: 9.44K
last activity: Sep 18, 2020
rstudio / keras
R Interface to Keras
lang: r
stars: 657
last activity: Sep 12, 2020
A declarative JavaScript library for application development using cloud services.
lang: typescript
stars: 7.39K
last activity: Sep 18, 2020
line / armeria
Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.
lang: java
stars: 2.73K
last activity: Sep 18, 2020
Flutter plug-in providing (a few) basic bindings to OpenCV-4.x. OpenCV methods implemented without the Core packages. WIP.
lang: dart
stars: 50
last activity: Sep 11, 2020
Graphical application for generating different color variations of a Arc, Materia and Oomox themes (GTK2, GTK3 and others), Archdroid, Gnome-Colors, Numix, Papirus, Suru++ icons, and terminal palette.
lang: python
stars: 1.24K
last activity: Sep 17, 2020
1-click, self-hosted deployment of OpenVPN with DNS ad blocking sinkhole
lang: python
stars: 1.09K
last activity: Aug 29, 2020
Apache Superset is a Data Visualization and Data Exploration Platform
lang: python
stars: 30.1K
last activity: Sep 18, 2020
Learn Rust with examples (Live code editor included)
lang:
stars: 3.66K
last activity: Sep 17, 2020
Repository which contains links and resources on different topics of Computer Science.
lang: css
stars: 3.63K
last activity: Sep 18, 2020
A virtual DOM library with focus on simplicity, modularity, powerful features and performance.
lang: typescript
stars: 7.94K
last activity: Sep 18, 2020
The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)
lang: java
stars: 1.46K
last activity: Sep 16, 2020
A simple GUI calculator🧮 built using C++
lang: c++
stars: 2
last activity: Aug 18, 2020
Image processing algorithms implementation in pure Python 🔧
lang: python
stars: 4
last activity: Aug 30, 2020
Stop Analyzing API is the core module of Tinder like tool to help your customers make up their mind with no pain
lang: go
stars: 11
last activity: Aug 27, 2020
Basic Utilities for PyTorch Natural Language Processing (NLP)
lang: python
stars: 1.79K
last activity: Sep 17, 2020
Allure Framework is a flexible lightweight multi-language test reporting tool. It provides clear graphical reports and allows everyone involved in the development process extract maximum of information from everyday testing process.
lang: java
stars: 1.94K
last activity: Sep 17, 2020
An open source Vagrant configuration for developing with WordPress
lang: shell
stars: 4.51K
last activity: Sep 18, 2020
agershun / alasql
AlaSQL.js - JavaScript SQL database for browser and Node.js. Handles both traditional relational tables and nested JSON data (NoSQL). Export, store, and import data from localStorage, IndexedDB, or Excel.
lang: javascript
stars: 5.2K
last activity: Sep 17, 2020
pygame / pygame
pygame (the library) is a Free and Open Source python programming language library for making multimedia applications like games built on top of the excellent SDL library. C, Python, Native, OpenGL.
lang: c
stars: 2.43K
last activity: Sep 18, 2020
fortio / fortio
Fortio load testing library, command line tool, advanced echo server and web UI in go (golang). Allows to specify a set query-per-second load and record latency histograms and other useful stats.
lang: go
stars: 1.45K
last activity: Sep 18, 2020
Calculator powered by Python. As simple as that.
lang: python
stars: 3
last activity: Sep 17, 2020
OpenGenus / cosmos
Algorithms that run our universe | Your personal library of every algorithm and data structure code that you will ever encounter | Ask us anything at our forum |
lang: c++
stars: 12.32K
last activity: Sep 18, 2020
Manage any infrastructure your applications need directly from Kubernetes
lang: go
stars: 2.56K
last activity: Sep 18, 2020
The reference P4 software switch
lang: c++
stars: 242
last activity: Sep 16, 2020
The Serverless Framework's new infrastructure provisioning technology — Build, compose, & deploy serverless apps in seconds...
lang: javascript
stars: 1.93K
last activity: Sep 16, 2020
📦 Find and install kubectl plugins
lang: go
stars: 2.96K
last activity: Sep 18, 2020
encode / httpx
A next generation HTTP client for Python. 🦋
lang: python
stars: 5.61K
last activity: Sep 17, 2020
An open source python library for automated feature engineering
lang: python
stars: 5.09K
last activity: Sep 17, 2020
Apollo Universal Starter Kit is an SEO-friendly, fully-configured, modular starter application that helps developers to streamline web, server, and mobile development with cutting-edge technologies and ultimate code reuse.
lang: javascript
stars: 1.54K
last activity: Sep 17, 2020
OpenEMR is the most popular open source electronic health records and medical practice management solution. ONC certified with international usage, OpenEMR's goal is a superior alternative to its proprietary counterparts.
lang: php
stars: 1.35K
last activity: Sep 17, 2020
buzzfeed / sso
sso, aka S.S.Octopus, aka octoboi, is a single sign-on solution for securing internal services
lang: go
stars: 2.49K
last activity: Sep 17, 2020
.NET APIs for commonly used programming patterns and utilities, such as dependency injection, logging, and configuration.
lang: c#
stars: 1.96K
last activity: Sep 16, 2020
akxcv / vuera
👀 Vue in React, React in Vue. Seamless integration of the two. :dancers:
lang: javascript
stars: 2.97K
last activity: Sep 15, 2020
KubeOperator 是一个开源的轻量级 Kubernetes 发行版,专注于帮助企业规划、部署和运营生产级别的 K8s 集群。
lang: go
stars: 2.82K
last activity: Sep 18, 2020
A Python library that implements software engineering best-practice for data and ML pipelines.
lang: python
stars: 2.92K
last activity: Sep 17, 2020
A frontend Framework for building B2B applications running in the browser on top of REST/GraphQL APIs, using ES6, React and Material Design
lang: typescript
stars: 14.11K
last activity: Sep 18, 2020
VanillaJS sortable lists and grids using native HTML5 drag and drop API.
lang: typescript
stars: 1.32K
last activity: Sep 14, 2020
The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support
lang: c#
stars: 2.33K
last activity: Sep 18, 2020
A cohesive design system to unify the web facing Creative Commons
lang: javascript
stars: 36
last activity: Sep 17, 2020
A drop-in collection of CSS styles to make simple websites just a little nicer
lang: css
stars: 5.28K
last activity: Sep 17, 2020
:city_sunrise: A collection of links for free stock photography, video and Illustration websites
lang:
stars: 9.29K
last activity: Sep 17, 2020
Interactive, thoroughly customizable maps in native Android, iOS, macOS, Node.js, and Qt applications, powered by vector tiles and OpenGL
lang: c++
stars: 3.86K
last activity: Sep 15, 2020
FastAPI framework, high performance, easy to learn, fast to code, ready for production
lang: python
stars: 21.02K
last activity: Sep 18, 2020
google / jax
Composable transformations of Python+NumPy programs: differentiate, vectorize, JIT to GPU/TPU, and more
lang: python
stars: 9.67K
last activity: Sep 18, 2020
certbot / certbot
Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.
lang: python
stars: 27.17K
last activity: Sep 18, 2020
The Data Transfer Project makes it easy for people to transfer their data between online service providers. We are establishing a common framework, including data models and protocols, to enable direct transfer of data both into and out of participating online service providers.
lang: java
stars: 2.98K
last activity: Sep 17, 2020
Cloud-free control webinterface for vacuum robots
lang: javascript
stars: 1.55K
last activity: Sep 17, 2020
iOS & tvOS multi-emulator frontend, supporting various Atari, Bandai, NEC, Nintendo, Sega, SNK and Sony console systems… Get Started: https://wiki.provenance-emu.com |
lang: c
stars: 4.31K
last activity: Sep 17, 2020
seata / seata
🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.
lang: java
stars: 17.25K
last activity: Sep 18, 2020
Access serial ports with JavaScript. Linux, OSX and Windows. Welcome your robotic JavaScript overlords. Better yet, program them!
lang: javascript
stars: 4.54K
last activity: Sep 17, 2020
PrismJS / prism
Lightweight, robust, elegant syntax highlighting.
lang: javascript
stars: 8.39K
last activity: Sep 17, 2020
Hermitcraft is one of the most popular Minecraft whitelisted server. This repository is aimed at making every hermit a smart thumbnail maker. We have till now completed building Cub's Contraption (for cubfan135) and we are currently working on TFC's Tool (for TFC) and Joey (for Joe Hills).
lang: css
stars: 2
last activity: Sep 9, 2020
Run multiple websites using the same Laravel installation while keeping tenant specific data separated for fully independent multi-domain setups, previously github.com/hyn/multi-tenant
lang: php
stars: 2.06K
last activity: Sep 17, 2020
Networking plugin repository for pod networking in Kubernetes using Elastic Network Interfaces on AWS
lang: go
stars: 1.29K
last activity: Sep 17, 2020
oilshell / oil
A new Unix shell. Our upgrade path from bash to a better language.
lang: python
stars: 1.34K
last activity: Sep 17, 2020
janko / vim-test
Run your tests at the speed of thought
lang: vim script
stars: 1.81K
last activity: Sep 17, 2020
🌐 🔌 The MetaMask browser extension enables browsing Ethereum blockchain enabled websites
lang: javascript
stars: 3.9K
last activity: Sep 18, 2020
MlFinLab helps portfolio managers and traders who want to leverage the power of machine learning by providing reproducible, interpretable, and easy to use tools.
lang: python
stars: 1.78K
last activity: Sep 18, 2020
Material design file manager for Android
lang: java
stars: 3K
last activity: Sep 18, 2020
getgauge / taiko
A node.js library for testing modern web applications
lang: javascript
stars: 2.5K
last activity: Sep 18, 2020
Work with remote images registries - retrieving information, images, signing content
lang: go
stars: 2.5K
last activity: Sep 17, 2020
ballercat / walt
:zap: Walt is a JavaScript-like syntax for WebAssembly text format :zap:
lang: javascript
stars: 4.39K
last activity: Sep 18, 2020
Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.
lang: python
stars: 2.02K
last activity: Sep 17, 2020
🦄 .NET orm, Mysql orm, Postgresql orm, SqlServer orm, Oracle orm, Sqlite orm, Firebird orm, 达梦 orm, 人大金仓 orm, 神通 orm, MsAccess orm.
lang: c#
stars: 2.11K
last activity: Sep 18, 2020
Personal CRM. Remember everything about your friends, family and business relationships.
lang: php
stars: 10.2K
last activity: Sep 18, 2020
ealush / vest
Vest ✅ Declarative validations framework
lang: javascript
stars: 961
last activity: Sep 17, 2020
elastic / rally
Macrobenchmarking framework for Elasticsearch
lang: python
stars: 1.21K
last activity: Sep 18, 2020
SVG icons for popular brands
lang: html
stars: 9.27K
last activity: Sep 17, 2020
The next small thing in web development, powered by Svelte
lang: typescript
stars: 6.09K
last activity: Sep 17, 2020
jenkins-x / jx
Jenkins X provides automated CI+CD for Kubernetes with Preview Environments on Pull Requests using Tekton, Knative, Lighthouse, Skaffold and Helm
lang: go
stars: 3.69K
last activity: Sep 17, 2020
The strictest and most opinionated python linter ever!
lang: python
stars: 1.14K
last activity: Sep 17, 2020
spack / spack
A flexible package manager that supports multiple versions, configurations, platforms, and compilers.
lang: python
stars: 1.74K
last activity: Sep 18, 2020
Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and MacOSX. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
lang: c++
stars: 2.18K
last activity: Sep 18, 2020
Mars is a tensor-based unified framework for large-scale data computation which scales Numpy, Pandas and Scikit-learn.
lang: python
stars: 1.88K
last activity: Sep 18, 2020
Headless Chrome .NET API
lang: c#
stars: 1.5K
last activity: Sep 18, 2020
A distributed operating system
lang: c
stars: 1.13K
last activity: Sep 16, 2020
Robotic fabrication package for the COMPAS Framework.
lang: python
stars: 30
last activity: Sep 16, 2020
stan-dev / stan
Stan development repository. The master branch contains the current release. The develop branch contains the latest stable development. See the Developer Process Wiki for details.
lang: stan
stars: 1.91K
last activity: Sep 18, 2020