I like the game idea, too. Well, for voice, not that much for voice chat while playing, because it depends on which game you're playing to.
For example, for a FPS, I tend to use voice chat mostly for team-based things. When I was in Sco team (an old team on BF2142) we used to chat more friendly too, but we were all french, chatting does not require as much brain time when it's mothertongue.
For a RPG, chatting's ok, even in english I guess.
For turn based games... well, maybe if turns are fast. That means: not for wesnoth, because I tend to do something else then.

As for the list of games... let me give you other places:

* https://libregamewiki.org/Main_Page
* https://www.lebottindesjeuxlinux.tuxfamily.org/

Those days, I'm playing mostly to Unvanquished (https://unvanquished.net), a team-based (humans vs aliens) FPS with strategy elements (aka: building bases). Aliens are a bit hard to handle though, especially for newcommers.
Games can be between 5 minutes (1 good player versus 2 newcommers, for example) and more than an hour (balanced teams).

I've played a lot to redeclipse 1.x too. Fast paced arena shooter, technical moves. Game time is set to 10 minutes on most servers. There's a fork named "blue-nebula" and a 2.x branch, which requires a lot better hardware and have drastic mechanic changes.

I know wesnoth pretty well, but I don't think it would be interesting for community playing as in "let's do a game from time to time" because it's a game which requires at least 1 hour for even fast games.

I don't know many FOSS RPGs, MMO or not, which I would like to play. There's Ryzom, but I fail to install it.


Another activity idea (which was why I logged initially): hackatons.

[edit]

About games... https://smcameron.github.io/space-nerds-in-space/ someday, I'd just love to try this one