Backlog - A cloud-based project management app for developers and their teams.
openDesktop.org - The website openDesktop.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
SourceForge - The Complete Open-Source and Business Software Platform.
Agilo for Scrum - Agilo for Scrum provides an intuitive workflow for your agile projects. Agilo addresses the needs of each scrum role and facilitates the ceremonies of the scrum process by exposing simple interfaces for managing the scrum artifacts.
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.