TiddlyMap - An interactive concept- and mind-mapping plugin for the personal note-taking software TiddlyWiki based on the Vis.js library. It's free and open-source!

Xmind - Xmind is a brainstorming and mind mapping application.

Minzel - Minzel is a beautiful and free mindmapping tool built for creatives and gives you the power to...

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.

Wisdomap - Wisdomap Medicine is a study aid that helps medical students create differential diagnoses and suitable management plans from a presenting complaint and structured revision notes.

Coggle - Coggle is a simple, beautiful, powerful way of structuring information.