TargetProcess - Agile Project Management Web Application
Taiga - Project management platform for agile developers & designers
Workboard - Workboard is a performance and productivity app managers use with their teams to share goals, priorities, actions and feedback.
Scrumwise - The most intuitive Scrum tool you've ever tried.
AchieveIt - AchieveIt software is designed to help align individuals, teams & organizations around the strategic initiatives that drive results.
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).