Construction toys are not quite a "file format", so to speak, but this site has a pretty broad-ranging definition. Since construction toys can be used to build elaborate structures and artworks, and consist of parts with well-defined characteristics and even interoperability issues, they deserve a place here.
- Goldie Blox
- Lego Mindstorms NXT (programmable robot)
- Lincoln Logs
- Stickle Bricks (referenced in this comic as Sticklebrix)
- Free Universal Construction Kit - bridges gap between different toy sets for interoperability
- More Than a Princess: Female Engineer Spends Life Savings to Design Construction Toy for Girls