PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.
Taiga - Project management platform for agile developers & designers
Leantime - Lean project management for startups & small teams
Craft.io - All-in-one product management software for entire product lifecycle
TargetProcess - Agile Project Management Web Application
icescrum - iceScrum is an open source scrum tool for agile software development.