openDesktop.org - The website openDesktop.
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
SourceForge - The Complete Open-Source and Business Software Platform.
Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.
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.
Process Street - Create beautiful rich process documents in a simple to follow checklist format. Fast, free and incredibly simple to use.