Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 CampfireSuper simple group chat, without a subscription, and you get the code too. | ReviewsNone yetWrite one for Campfire | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb, PWA | Main features
|
 ElementSecure communications built on the decentralised Matrix open standard | ReviewsNone yetWrite one for Element | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onWeb, macOS, Windows, Linux, iOS, Android | Main features
|
 MattermostZero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments | ReviewsNone yetWrite one for Mattermost | Lowest paid planSee plans | Free planNot confirmed | Free trialYes | Public APIYes | Runs onWeb, Windows, macOS, Linux, iOS, Android | Main features
|
 Rocket.ChatOne secure platform for messaging, voice, video, apps and AI | ReviewsNone yetWrite one for Rocket.Chat | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs oniOS, Android | Main features
|
 WireMessaging, calls, conferencing, and file sharing, fully end-to-end encrypted and open source. | ReviewsNone yetWrite one for Wire | Lowest paid plan€7.45per person per month, billed annuallyWire for SMB, as of October 28, 2026 | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onAll platforms, Web | Main features
|
 ZulipOrganized chat for distributed teams | ReviewsNone yetWrite one for Zulip | Lowest paid plan$6.67per user per month, billed annually, or $8 billed monthlyStandard, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb, Windows, macOS, Linux, iOS, Android | Main features
|
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a self-hosted version. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed