OREKIT is a free low level space dynamics library written in Java. Please visit our Gitlab instance for issues and contributions: https://gitlab.orekit.org
OrbitalTrajectories.jl is a modern orbital trajectory design, optimisation, and analysis library for Julia, providing methods and tools for designing spacecraft orbits and transfers via high-performance simulations of astrodynamical models.
The Orbital Debris Ontology (ODO) is an ontology of the orbital debris domain, containing classes for orbital entities and concepts, such as the types of orbital debris.
A cataloging and examination of terms and definitions in astronautics (spaceflight). This is a task in the Astonautical Knowledge Modeling project, and related ontology projects by Robert Rovetto.
Micro-gravity Metal FDM payload for Blue Origin, with the University of Louisville Computational Thermal & Fluid Dynamics Laboratory (http://yongshenglian.wixsite.com/ctflab)