Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Xmind - Xmind is a brainstorming and mind mapping application.
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
LuckyCrush - Live random video chat
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.