Modern, lightweight and efficient 2D level editor

Cross-Platform Level Editor

An open source alternative to Valve's Hammer Editor for the Goldsource engine. (No longer in development)

Realtime-CSG, CSG level editor for Unity

Dust Racing 2D is a traditional top-down car racing game including a level editor.

DarkRadiant is the map editor for The Dark Mod and other idTech4/Doom3-based games

The open-source, cross-platform level editor for id Tech based games.

Experimental level editor for Super Mario Odyssey (EditorCore plugin)

Uses the collider of a PolygonCollider2D to generate a mesh for a Unity GameObject.

A supercharged fork of the modern day level editor.

Level editing suite for The Legend of Zelda: The Minish Cap

Kirby's Dream Course / Kirby Bowl level editor (C++ / Qt)

Level editor for Hexcells

CAMM (Crystal Alien Map Maker) open source level/map editor for CrystAlien Conflict.

2D editor written in Haxe Kha

Unity3d Editor tools to create rooms quickly.

THPS Scene import/export for Blender

Kirby's Adventure Level Editor (C++ / Qt)

Level Editor for the PC version of Sonic Generations

N-Space: a mobile app for building 3D interactive worlds

A Sokoban-esque puzzle game developed in unity 3D in 2016

A set of modding tools for the Ratchet & Clank PS2 games.

A custom Source Engine level editor written in Go

A prototype for runtime cooperative level designing in Unity 3D

TR2-Level-Viewer is a crossplatform Unity level viewer for classic game Tomb Raider 2. Original TR2 formatted level files as well as TRLE files can be loaded with this project. It is also possible to save generated level with this project. This project can be deployed in all Unity supported devices including iPhone, iPad, Android Devices, PC, MAC.

Level Buddy add-on for Blender written by Matt Lucas (mirror)

Wario Land 4 Level Editor.

Tool for Unity that allows you to quickly bash objects in the scene with randomized parameters.