CodeTriage - Help out your favorite open source projects and become a better developer while doing it.
Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...
24 Pull Requests - 24 Pull Requests is a little project to promote open source collaboration during December.
Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.
Gitpay - Add bounties to solve Git issues from projects.
jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.