Xmind - Xmind is a brainstorming and mind mapping application.
Outro - A new take on retrospectives for progressive 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.
Neatro - Neatro is the online Agile retrospective platform designed to help teams improve continuously.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
Retroly - A fun simple tool for agile retrospectives