Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

openDesktop.org - The website openDesktop.

Redmine - Flexible project management web application

SourceForge - The Complete Open-Source and Business Software Platform.

Basecamp - A simple and elegant project management system.

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.