Nullboard - Minimalist locally-stored kanban board / task list manager.
Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...
Waffle - Split screen picture conversations with friends
Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.
Brisqi - Offline-first personal Kanban app
jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.