Taiga - Project management platform for agile developers & designers
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.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
Colorkit - A productivity tool for color management for designers
TargetProcess - Agile Project Management Web Application
Leantime - Lean project management for startups & small teams