github.com/42wim/matterbridge (go): bridge between mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat, twitch, ssh-chat, zulip, whatsapp, keybase, matrix, microsoft teams, nextcloud, mumble, vk and more with REST API (mattermost not required!)
Keywords: bridge|counter-strike|discord|facebook-messenger|gitter|irc|matrix|mattermost|microsoft-teams|minecraft-chat|mumble|nextcloud|rocketchat|slack|telegram|twitch|vk|whatsapp|xmpp|zulip