Lean Testing

Bug tracker, test case manager.

Jira

Project tracking tool.

YouTrack

Issue tracker designed for development teams.

Redmine

Open source project management tool.

Trac

Enhanced wiki and issue tracking system.

Bugzilla

Open source bug tracker.

Mantis Bug Tracker

Open source issue tracker.

Usersnap

Smart feedback to build great products.

Pivotal Tracker

Agile project management tool.