Roundup Issue Tracker 1.6.0

Roundup is a simple-to-use and install issue-tracking system with web, command-line xmlrpc, rest (in the 2.0 development line) and e-mail interfaces. It is based on the winning design from Ka-Ping Yee in the Software Carpentry Track design competition. Downloading the source allows you to start a demo instance in a few minutes to see if it will fill your needs.

Eventum 3.6.5

Eventum is a user-friendly and flexible issue tracking system that can be used by a support department to track incoming technical support requests or by a software development team to quickly organize tasks and bugs. Eventum is used by the MySQL AB Technical Support team, and has allowed them to dramatically improve response times.

Trac 1.0.4

Trac is a software project and release management tool, and source control frontend for Git and Subversion. It provides issue tracking, timelines, progress/roadmap tracking and documentation features (Wiki with MarkDown support).