A free web-based diagram editor

Gliffy
Free
Offline
Trial
gliffy

Why Use Diagrams?
Diagrams are visual representations of ideas. They’re also the fastest, funnest, easiest way to say something. Drawn well, a single diagram does the work of thousands of words—and does it better. They've become a must-have for modern teams.

Diagram types & examples
There are infinite types — from complex diagrams used for software engineering to simple org charts. To give you an idea of what diagrams can do, we’ve rounded up common ones below. If you can dream it, you can draw it with Gliffy.