Lua 2D/3D game engine.
An arm operating system
Stacks is a simple high-level dynamically-strongly-typed stack-based interpreted programming language, designed to be easy-to-implement (even in assembly, primarily in Strvolution), and easy-to-use.
An OpenVR driver for using artrackers as extra controllers via the Aruco library and mutliple "camera" computers over the network.
Stuff for doing things on the 3DS
A simple computer, made with the 6502 (including a simulator).
An original NES assembler