Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.

Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.

jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.

Basecamp - A simple and elegant project management system.