Handmade 2D game and engine. This is currently my main project. Source code is here.
Spinning transparent cube in C and OpenGL. Ported to multiple platforms including WASM and WebGL. Source code is here.
Spell words with the elemental symbols from the periodic table ("He", "Cu", etc).
Example: AmPuTaTiON.
Pseudo 3D tunnel renderer.
A simple texture is transformed based on each pixel's distance and angle from the center.