42wim/matterbridge: bridge between mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat, steam, twitch, ssh-chat, zulip, whatsapp, keybase, matrix, microsoft teams and more with REST API (mattermost not required!)https://github.com/42wim/matterbridge
Pont entre Mattermost et plein d'autre systèmes (dont Slack)