aramis erak
Legend
GTove is open source and browser based for the client, but requires a google drive.We have been thinking about hosting a VTT for ENW/ENP (and for Level Up, integrating with our A5E tools site). We don't have the resources to make one from scratch, but we might be able to hack/modify an open source platform.
a) browser-based
b) open source (for commercial applications)
My initial thought was Owlbear Rodeo v1, which is now open source, but it's for personal use only.
It may be that such a beast does not exist, but I thought I'd ask around and see if anybody knew of one.
The server is also open source.
GitHub - RobRendell/gTove: A simple virtual gaming tabletop webapp in 3D, using Google Drive as the backing store.
A simple virtual gaming tabletop webapp in 3D, using Google Drive as the backing store. - RobRendell/gTove
It has physics based dice, decent rendering, easy map calibration, vertical stacking of maps; supports mac, windows, linux and android, and, at present, doesn't require hosting your own server unless you're customizing.
It is, however, fairly bare bones. It lacks a lot of the automation of the commercial ones.
It lacks voice chat, but discord is good; I use GTove weekly for my sunday game.