https://vrsketch.eu/ - Editing and viewing virtual reality plugin for sketchup. It's a lot of basic research on UI/UX in VR.

http://pypy.org - Python interpreter with a just in time compiler. It's the only alternative python implementation out there, after failures of unladen swallow/pyston etc.

http://bloc11.co.za - Own climbing gym. It's cool to work directly with people and pursue own ideas in a small space.