Xmind - Xmind is a brainstorming and mind mapping application.
Taiga - Project management platform for agile developers & designers
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
TargetProcess - Agile Project Management Web Application
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
Craft.io - All-in-one product management software for entire product lifecycle