Mattermost

Open source, on-premises, Slack alternative

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christian stewart — Brand Strategist @ Anomaly
Slack, HipChat, ChatGrape, Flowdock, Unison, Glip, Cotap, Lua, Hall, Fleep, Kato, Twoodo, Convo, Stackfield, Svyft, campfire, Pie, Imbox.me, Bitrix24, Huddle, Teamnote, IBM Verse, Confide, Moxtra, Teamwork, Circuit by Unify, Central Desktop, Wrike, Yammer, Jive, Honey, Facebook @ Work, TigerText, Skype, Incentive Corp, and mattermost. Good luck gents
Javin Ladish — Designer
@stewart_cc And not to mention, Slack.
Salim Virani — Founder-Centric
@stewart_cc Are any of those open source? Might be a clear differentiation in such a competitive space.
christian stewart — Brand Strategist @ Anomaly
@saintsal Excellent point. And no, not that I know of.

Slack is catching on outside of non-technical/developer teams though, and even within the tech field- how valuable is open-source vs. a pretty-polished product like Slack?
Salim Virani — Founder-Centric
@stewart_cc In developing economies and some governments and enterprises, open source makes a big difference. (And modern open source doesn't necessarily mean bad UX or lack of polish. Take Ghost and Fedora for example.)
Gabriel Engel — CEO, Konecty and Rocket.Chat
Hi @saintsal @stewart_cc have you checked out http://rocket.chat/ ? It is a MIT Licence, 100% JavaScript, Open-Source, self-hosted alternative. Let me know what you think of it?
H
Kat Manalac — Partner, Y Combinator
Mattermost is an open-source Slack alternative for team communication. It's built by YC alums SpinPunch. You can host Mattermost on your own servers, and build whatever new functionality you want atop the code base.
M
Ian Tien — CEO, Mattermost / SpinPunch
thanks @katmanalac!

Mattermost team here,

We wrote Mattermost to solve our own needs, in running an indie video game company (aka "SpinPunch"). We open-sourced it because friends kept asking for the code.

We're so glad to share this with you, and look forward to your comments, questions, and feature requests,
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