What are some free online flow chart tools?

Question

Can somebody tell me of a tool that helps draw a flow chart online (to collaborate) but not make it public. I did see http://stackoverflow.com/questions/1952450 that talks of gliffy but it makes charts public in the free mode.

Answer 1

Eh... I'd just use vim + graphviz + git, but that's just me.

Answer 2

This was recommended to me: Web Sequence Diagrams.

http://www.websequencediagrams.com/

HTH