
Lucidchart
Online diagram and flowchart software that supports Microsoft Visio import and can work on any operating system.
PlantUML based on-line UML editor (text to UML) with optional Google registration and document saving.
The PlantText tool is an online tool for quickly creating UML (Unified Modeling Language) diagrams. Unlike most tools, PlantText can build diagrams without the use of a mouse because it is based on PlantUML markup language.
flowchart uml diagram uml-modeling