Parabol - Agile Meeting Co-Pilot

Xmind - Xmind is a brainstorming and mind mapping application.

Retrium - Sprint retrospectives made easy and effective for distributed scrum 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.

Reetro.io - Reetro is a versatile retrospective tool for agile teams, collaborate with your team and get better in what you do with a simple, intuitive and beautiful tool

MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.