Atlassian JIRA - Atlassian JIRA is a project management and tracking software for the business users, developers, programmers, etc.
openDesktop.org - The website openDesktop.
Pivotal Tracker - Pivotal Tracker: The awesome, lightweight, agile project management tool for software teams. Get your 30-day Free Trial started today!
SourceForge - The Complete Open-Source and Business Software Platform.
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.