One of the contributing devs made an open source version: warfront.io, which openfront is forked from and then heavily developed.
Warfront did not have any multiplayer so Evan, the creator of openfront, made it multiplayer and together with contributors made lots of new features.
Recently there has been some new activity on the warfront repo. Warfront added webgl rendering, and hopefully Openfront will have be inspired. Openfront does not work nicely on mobile and low end devices currently.