Thought I'd make a list of all the unfinished programs I've ever made....
(Note: Really old ones aren't included)

The list

Bounce 2D Vector engine: Would work great for a pinball game.

Vector Editor: [link]

2D Ragdoll engine: [link]

Html Code Indenter: ---

3D Model maker: [link]

Neural network: Without a purpose

Rpg Editor: [link]

2D Collision And Movement physics engine: My current project.