TeamClerk - Team Clerk is project and task management software that automatically keeps your team organized and monitors progress of all of your projects and tasks. Let us organize what you do,so you can focus on why you do it.
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.
Redmine - Flexible project management web application
GoodDay - Good Day - Inspiring work management
jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.
Taiga - Project management platform for agile developers & designers