Lexica - An open source word-search game.
Xmind - Xmind is a brainstorming and mind mapping application.
Crosswords Arena - Word game, multiplayer and computer players
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Word Domination - Word Domination is a fast paced and addictive real-time word game.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.