Xmind - Xmind is a brainstorming and mind mapping application.
Tanglet - Tanglet is a single player word finding game based on Boggle.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Ruzzle - Ruzzle is a fun and fast-paced word game where you can challenge your friends or allow an opponent...
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
Webfeud - Two players play in any game of Webfeud.