Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

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!)

Open-source live customer chat

Mattermost Desktop application for Windows, Mac and Linux

some personally made dockerfile

Save or export your private and public Slack messages, threads, files, and users locally without admin privileges.

A feature-rich Unix terminal client for the Mattermost chat system

Deprecated

PingMe is a CLI which provides the ability to send messages or alerts to multiple messaging platforms & email.

Push notification SDK(AnPush、Bark、Chanify、DingTalk、Discord、Gitter、GoogleChat、IGot、Lark、Mattermost、MicrosoftTeams、NowPush、Ntfy、Push、Pushback、PushBullet、PushDeer、PushMe、Pushover、PushPlus、QQ、RocketChat、ServerChan、ShowdocPush、SimplePush、Slack、Telegram、WeWork、WPush、XiZhi、YiFengChuanHua、Zulip).

Connect to your mattermost or slack using your IRC-client of choice.

A python-based chatbot for Mattermost (http://www.mattermost.org).

Create polls and surveys directly within Mattermost

A Mattermost plugin for communicating daily standups across teams

Jitsi plugin for Mattermost 🔌

😈 An extensible chat bot framework. sactive-bot is an evolution of the open source hubot project. - https://www.shipengqi.top/sactive-bot .

Redux for Mattermost

Hubot adapter for Mattermost using Web API and Websockets

a mattermost plugin that sets reminders for users and channels.

Messenger plugin for Redmine with Slack, Discord, Rocket.Chat and Mattermost support