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.
TargetProcess - Agile Project Management Web Application
Redmine - Flexible project management web application
Taiga - Project management platform for agile developers & designers
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.