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.
Backlog - A cloud-based project management app for developers and their teams.
Redmine - Flexible project management web application
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
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.
SourceForge - The Complete Open-Source and Business Software Platform.