Xmind - Xmind is a brainstorming and mind mapping application.
Leantime - Lean project management for startups & small teams
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Taiga - Project management platform for agile developers & designers
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.