File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Xmind - Xmind is a brainstorming and mind mapping application.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.