Ura Design donates great UX to open source projects: 
Open source software is nothing new in an age where even big tech giants are exploring and using it. More and more companies allow—if not outright encourage—employees to contribute to open source software on company hours. What’s missing in open source, however, is high-quality, effective design.
read more: Opensource.com jflory7
Supporting Open Source.
Have you tried: Diving with Sharks?