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Open-source alternatives to Slack

Slack is a cloud-based messaging platform for teams and organizations. It provides persistent chat channels, direct messages, voice and video calls, and integrations with third-party tools.Slack is made by Salesforce. It is not open source. These 22 open-source projects do the same job, closest first.

Communication

Compare at a glance

Open-source alternatives to Slack: platforms, Docker, license, GitHub stars and last commit
ProjectTypeSelf-host with DockerLicenseStarsLast commit
HulyDocker / self-hostYesEPL-2.028k
MattermostWeb, Docker / self-host, DesktopYesCustom (read before use)39k
ZulipDocker / self-hostYesApache-2.026k
Rocket.ChatWeb, Docker / self-host, Desktop, MobileYesCustom (read before use)46k
LemmyDocker / self-hostYesAGPL-3.015k
ChatwootDocker / self-hostYesCustom (read before use)39k
converse.jsWeb, Library / SDKNot listedMPL-2.03.3k
NextcloudWeb, Docker / self-hostYesAGPL-3.037k
DiscourseWeb, Docker / self-hostYesGPL-2.048k
LangBotDocker / self-hostYesApache-2.019k
ElementWeb, DesktopNot listedAGPL-3.014k
HubotLibrary / SDKNot listedMIT17k
Telegram DesktopDesktopNot listedGPL-3.033k
SimpleX ChatDesktop, MobileNot listedAGPL-3.020k
freescoutWeb, Docker / self-host, MobileYesAGPL-3.04.6k
Buzz (Block)DesktopNot listedApache-2.037k
jitsi-meetWeb, Docker / self-host, Mobile, Library / SDKYesApache-2.030k
Socket.IOLibrary / SDKNot listedMIT63k
NodeBBWeb, Docker / self-host, CLIYesGPL-3.015k
bitchatMobileNot listedUnlicense37k
diasporaWebNot listedAGPL-3.014k
Signal for AndroidMobileNot listedAGPL-3.030k

The alternatives