CONV. - Convert YouTube video to MP3, GIF or MP4
Xmind - Xmind is a brainstorming and mind mapping application.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Yout - YouTube to Mp3 Converter
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.