Brief Rocket.Chat is an open-source team communication application with features and looks similar to Slack. You are free to self-host it or opt for their managed service for a fee.
Slack is a useful and popular team communication app that potentially replaces emails for work. A lot of big and small teams use it even we at It8217s FOSS relied on Slack initially.
However we needed a good open-source alternative to Slack and that8217s when we came across Rocket.Chat. Sure there are several other open-source slack alternatives but we opted for Rocket.Chat for its similarity with Slack and ease of deployment.
Rocket.Chat is an open-source communication platform for team collaboration.
You get all the essential features to facilitate proper communication along with the option to get started for free opt for hosted service by the Rocket.Chat team or deploy it on your server.