Tools

Runtime World - 3D world editor (free and paid versions)
Runtime Mapas - 2D tilemap editor (opensource)

Tech

LIL - highly dynamic interpreted language in a pair of .c/.h files (opensource, c)
FPLIL - LIL implementation in FreePascal (opensource, freepascal)
Flash MOD Player - Amiga MOD player for Flash 9 and later (opensource, haxe)
SOB, The SWF Obfuscator - SWF obfuscator (opensource, c)
Alithia Engine - minimalistic 3D engine (opensource, c)

Other

You can find some other of my projects (some game related) in the repositories. Also some other stuff is in my GitHub profile (note, however, that i migrate -very slowly- away from GitHub in favour of Fossil).