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.
KADOS - KADOS is web-based tool for managing SCRUM projects and other Agile projects
Redmine - Flexible project management web application
GoodDay - Good Day - Inspiring work management
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.