Xmind - Xmind is a brainstorming and mind mapping application.
Chudo Virtual Spaces - Play around, meet friends, study or party with avatars!
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Teooh - Meet, work or just hang out in virtual spaces as avatars.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
VRChat - Create and play in virtual worlds with others