Laravel - A PHP Framework For Web Artisans
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
CodeIgniter - A Fully Baked PHP Framework
KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.
Symfony - A PHP full-stack web framework
Meistertask - MeisterTask is an intuitive task management and collaboration tool.