UML Online Tool

 

Q : 

Is there any free online UML modelling tool? 

 

A : 

By "online", I assume you mean browser based and no-install. Otherwise this is a duplicate question because there are already multiple questions/answers here on stackoverflow with many free UML tool suggestions.

 

Free:

 

http://yuml.me/

http://www.asciiflow.com/

http://www.websequencediagrams.com/ (sequence diagrams only)

Not free, but cheap:

 

http://www.gliffy.com/uses/uml-software/

http://creately.com/

There's also the excellent and free Violet UML editor which can be run via Java WebStart. Probably not what you had in mind though, and no built-in sharing capability.

 

From : 

http://stackoverflow.com/questions/6877121/is-there-any-free-online-uml-modelling-tool