Discord really annoys me, because it stole so many of my mumble/murmur friends who ignored it's anti-features and black box nature. I still prefer the technica

Discord really annoys me, because it stole so many of my mumble/murmur friends who ignored it's anti-features and black box nature. I still prefer the technical capabilities of mumble for voice, but so far the best foss alternative to discord I am aware of is mattermost. Anyone aware of any others similar?