Xmind - Xmind is a brainstorming and mind mapping application.
DC++ - DC++ developed by Jacek Sieka.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
EiskaltDC++ - EiskaltDC++ is a program for UNIX-like systems that uses the Direct Connect and ADC protocol.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
AirDC++ - AirDC++ is an easy way to share files between users.