Pencil is a standalone app or Firefox extension that lets you create diagrams or UI mockups. It doesn't have collaboration/mul ...

Cacoo is a user-friendly online diagramming tool that allows you to create a variety of diagrams such as wireframes, flowchart ...

This software empowers users to construct, navigate, share, and criticize knowledge models represented as Concept Maps. The to ...

Calligra Flow is an easy to use diagramming and flowcharting application with tight integration to the other Calligra applicat ...

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere ...