diff --git a/README.md b/README.md
index f982b784..be7d5d74 100644
--- a/README.md
+++ b/README.md
@@ -343,7 +343,6 @@ _Related: [Groupware](#groupware)_
 - [Hyphanet](https://hyphanet.org/) - Anonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums. ([Source Code](https://github.com/hyphanet/fred)) `GPL-2.0` `Java`
 - [Jami](https://jami.net/) - Universal communication platform which preserves the user's privacy and freedoms. ([Source Code](https://git.jami.net/savoirfairelinux?sort=latest_activity_desc&filter=jami)) `GPL-3.0` `C++`
 - [Live Helper Chat](https://livehelperchat.com/) - Live Support chat for your website. ([Source Code](https://github.com/LiveHelperChat/livehelperchat)) `Apache-2.0` `PHP`
-- [Mattermost](https://mattermost.com/) - Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack). ([Source Code](https://github.com/mattermost/mattermost)) `AGPL-3.0/Apache-2.0` `Go/Docker/K8S`
 - [Mumble](https://wiki.mumble.info/wiki/Main_Page) - Low-latency, high quality voice/text chat software. ([Source Code](https://github.com/mumble-voip/mumble), [Clients](https://wiki.mumble.info/wiki/3rd_Party_Applications)) `BSD-3-Clause` `C++/deb`
 - [Notifo](https://github.com/notifo-io/notifo) - Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin. `MIT` `C#`
 - [Novu](https://novu.co/) - Notification infrastructure for developers. ([Source Code](https://github.com/novuhq/novu/)) `MIT` `Docker/Nodejs`
diff --git a/non-free.md b/non-free.md
index b2b84edf..4632e198 100644
--- a/non-free.md
+++ b/non-free.md
@@ -77,6 +77,7 @@
 
 - [Chatwoot](https://www.chatwoot.com) - Customer communication platform (alternative to Intercom and Zendesk). ([Source Code](https://github.com/chatwoot/chatwoot)) `⊘ Proprietary` `Ruby/Docker/K8S`
 - [Groupboard](https://www.groupboard.com/products/) - Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback. `⊘ Proprietary` `Unknown`
+- [Mattermost](https://mattermost.com/) - Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack). ([Source Code](https://github.com/mattermost/mattermost)) `⊘ Proprietary` `Go/Docker/K8S`
 - [PrivMX WebMail](https://privmx.com) - Alternative private mail system - web-based, end-to-end encrypted by design, self-hosted, decentralized, uses independent PKI. Easy to install and administrate, freeware, open-source. `⊘ Proprietary` `PHP`
 - [Virola Messenger](https://virola.io/) - Instant messaging and collaboration tool with private and group chat rooms, continuous voice and video meetings, files sharing, issue tracking with integrated task board (alternative to Slack). `⊘ Proprietary` `C++`
 - [WorkAdventure](https://workadventu.re) - Virtual office / virtual conference application presented as a 16-bit RPG video game. ([Demo](https://play.staging.workadventu.re/@/tcm/workadventure/wa-village), [Source Code](https://github.com/workadventure/workadventure)) `AGPL-3.0/Commons-Clause` `Docker`