Alive as of March 2020
Development may have halted, but there's a "service outage" note on the site as of 2020-03-29. So someone's at least keeping it running in maintenance mode.
* Astral
* d20Pro
* EpicTable
* Fantasy Grounds
* MapTool
* Roll20
* Rolisteam
* RPG Plus
* tabletopRPG.io
* Tabletop Simulator
* Arkenforge (alpha)
* Fantasy Grounds Unity (closed beta)
* FoundryVTT (closed Beta)
* Let's Role (closed Alpha)
* Mythic Table (Q1/Q2 2020 playtest aim)
* 3D Virtual Tabletop
* BattleBox 3D
* Battlegrounds RPG Edition
* GM Forge
* ScreenMonkey
* Skirmish VT
* Skwyre