Was about to suggest that myself (but searched and found you already had). I've not looked in recently so I don't know how much development is going on, but I wasted many a bit of time playing this and its variants with a group of friends while at Uni two decades ago.
Key-words for those searching: cross-platform, open source, multi-player, fun.
Key-words for those searching: cross-platform, open source, multi-player, fun.