Pp-script implements a scriptable method of generating complex diagrams as needed in math and science textbooks. It makes it simple to draw 3D diagrams as needed for many linear algebra textbooks. It is also extendable via lisp.
A game developed by Reddit community
This is an Open Source game based on drumo's design and concept art which is developed by Reddit community. If you don't use Reddit, you are still more then welcome to use it.