PlantUML

NClass is a free tool to easily create UML class diagrams with full C# and Java language support.

Calligra Flow (formerly Kivio) is an easy to use diagramming and flowcharting application with tight integration to the other Calligra applications. It enables you to create network diagrams, organisation...

Oqto is a powerful diagram creation and editing tool available on your tablet or smart phone. With Oqto Diagram you can create flowcharts, organization charts, mind maps, finite states machines, …

MindBerry is a mind-mapping software for BlackBerry smartphones. It's the ideal software for organize your thoughts, manage information overload, increase your productivity and creativity. Capture and...

NShape is an Open Source diagram designing framework for .NET WinForms. Software developers use NShape to integrate diagramming capabilities into their applications. Using NShape, applications let users view, annotate, modify …

my.origramy is an online service that lets you create any complex graphs, presentations, schemes - anything you want - for free. The background of the service is the Origramy flash …

Gephi is an open-source software for visualizing and analyzing large networks graphs. Gephi uses a 3D render engine to display graphs in real-time and speed up the exploration. Use Gephi …

Dont lose the advantage of clarity and simplicity to an overly complicated tool - the Poseidon for UML software line lets you get down to work without entanglements in your …

Mental organization and visualization. MindSky.

Gaphor is a Python-based, easy to use modeling environment. This means that you are able to create nice UML diagrams for documentation and to assist you with design decisions. Gaphor …