Sunflow : Sunflow is an open source rendering system for photo-realistic image synthesis. It is written in Java and built around a flexible ray tracing core and...
Space Engine – the universe simulator : SpaceEngine is a realistic virtual Universe you can explore on your computer. You can travel from star to star, from galaxy to galaxy, landing on any ...
Pixel-art scaling algorithms - Wikipedia : 
Pixel-art s...
Constraint Systems : 20 alternative interfaces for creating and editing images and text
https://github.com/constraint-systems
Flow
An experimental image editor tha...
