This is an open-source online implementation of the board game Terraforming Mars: Expedition Ares. It is not affiliated with FryxGames, Asmodee Digital or Steam in any way.
Buy The Board Game
The board game is great and this repository highly recommends purchasing it for personal use.
You can play the game online at https://expedition-ares-fe.herokuapp.com/
This is a free heroku instance, so it may take about half a minute to warm up if it hasn't beed used for half an hour.