productboard - Beautiful and powerful product management.
openDesktop.org - The website openDesktop.
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.
SourceForge - The Complete Open-Source and Business Software Platform.
ProductPlan - Cloud-based product roadmap software solution
Freecode - Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.