I still use mumble with friends for general voice chat. I really wish more games implemented its MumbleLink API for positional audio between clients. https://wiki.mumble.info/wiki/Link For example, GW2 implements so people sound relative to where your characters are if they are on the same map. https://wiki.guildwars2.com/wiki/API:MumbleLink The API has also allowed for other tools such at GW2 Tactical Overlay ( http…
Happy to see people using that! :) I implemented that Mumble integration while I was at ArenaNet.
So, even if not used for Mumble, it's now a pretty big feature for other 3rd party software. I use it regularly myself.
(For the unfamiliar: gw2taco et al use position/viewport data, I guess, from the GW2 Mumble API to draw an overlay on top of the game with navigational markers/aids.)