42wim/matterbridge
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...
bridge between mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat , ... Mattereddit (Reddit chat support); fbridge (Facebook messenger support) ...