UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
Xmind - Xmind is a brainstorming and mind mapping application.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.