Mattermost

“Mattermost is a decent slack clone that can be self hosted.”

“Mattermost isn't actually all that bad and its mental model is pretty close to Slack”

“The quality of Mattermost and Zulip was NOT exactly as polished as Slack.”

“there is almost always an open-source alternative that is 10x better in many ways”

“it's been stable and performant so I can't really complain”

“quite mature and used at scale by some orgs around me”

“I set up mine for family but it's ended up mostly being used by my bots for reporting things to various channels via webhooks.”

“it's been pretty seamless and I was able to import the full Slack history into it”

“It’s effectively a slack cove and works pretty great.”

“they place a bunch of restrictions on you in regards to calls”

“Mattermost is 90% of Slack. It’s great.”

“until they handicapped the most recent version by limiting the number of messages on the self hosted version”

“first class packaging for quick and easy roll out”

“Mattermost is quite good these days”

“Mattermost, Rocketchat and others have first class packaging for quick and easy roll out.”

“Fine for a small team (around 40 active users here) where you can script account actions via the API”

“mattermost is pretty great”

“there was an uproar a couple of months ago about them just switching up message history and deleting conversations”

“One service easily hosted with Docker. One app, and easy invites.”

“editor leans towards native Markdown so things like syntax highlighting with backticks work as you expect”

“I quite liked Mattermost except for the mobile app being trash.”

“This really seems like a dual license situation where they are saying”

“deliberately keeping the license vague and confusing to scare users into paying for a commercial edition”

“to advertise a tool as open source license but then violate the open source licensing method both in spirit and the letter of the law”

“the search function actually worked which is better than I can say for Slack”

“Slack competitors like Teams, Zulip, and Mattermost all offer easy ability to integrate with anything that can make a web request.”

“there are good selfhostable options (nextcloud, mattermost/zulip)”

“That's also more flexible (can send commands back to the bot, etc.)”

“Mattermost is infamous crippleware and they charge more than slack for a worse product if you pay.”

“some of those things like minio and mattermost are complaints about the free tier”

“trust is everything when it comes to such a core part of a company”

“They’ve been slowly introducing limits to the Team Edition and screwing with the licensing in obtuse ways to drive revenue”

“mattermost probably is the right choice anyway, but you wouldn't want to be the guy who convinced others they should switch”

“I recently switched a bunch of friends from a project-oriented whatsapp chat to self-hosted mattermost”

“the practice of crippling your opensource offering by removing features or adding limits is evil and shameful”

“every single migration from paid to free software, will end up in the same cycle of becoming feature-locked”

“This seems like a poorly hashed out plan, but I do have some sympathy”

“Bait contributors by a FOSS-like model, then switch the mode to sell the results of their contributions without paying them back.”

“I use MM for about a year. Forking it would be a major undertaking as the number of vulnerabilities for which you would need to backport is quite high”

“Gating reasonable OAuth support behind the paid version is crippleware”