Normally code version control systems but can be used to store and collaboratively contribute other things:
- 3D models
The technology normally used is call *git* an unfortunate name but it enables to easily collaborate between multiple people. You do NOT need to be logged into these services to download the projects or view the text contained. But do consider them work in progress unless other wise stated. PLEASE CONTRIBUTE TO THEM. Anything from feedback, documentation and raising issues.