Skirmish VirtualTabletop
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Skirmish VT is a VTT in free Beta, that have a separate client and a server client. Plans exist for expanding into mobile platforms like Android and iOS.

Client and Server clients can be downloaded after registering and logging in or their homepage

Links:

Forums
News
Youtube
Twitter

Platform:

Windows
Android(planned)
iOS(planned)

Price:

free (in Beta)