Xmind - Xmind is a brainstorming and mind mapping application.
OpenideaL - Get OpenideaL's open source idea management platform, collecting insights from employees & customers, with DevOps support from HOSSTED.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Bluescape - Bluescape is a visual collaborative workspace designed to elevate work that empowers creation, collaborate, and innovate across the entire enterprise.
Viima - Viima is the simple, yet incredibly powerful Agile Innovation Platform that helps you go from ideas to innovations – at the speed and scale of a true innovator.
Idea Drop - Set team challenges to capture the very best business ideas