{"id":485,"date":"2026-10-14T17:31:08","date_gmt":"2026-10-14T17:31:08","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/2016\/07\/28\/4-open-source-alternatives-to-slack-for-team-collobartion-and-chat\/"},"modified":"2026-10-14T17:31:08","modified_gmt":"2026-10-14T17:31:08","slug":"4-open-source-alternatives-to-slack-for-team-collobartion-and-chat","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/4-open-source-alternatives-to-slack-for-team-collobartion-and-chat\/","title":{"rendered":"4 Open Source Alternatives to Slack for Team Chat: IRC, Let\u2019s Chat, Mattermost, and Rocket.Chat"},"content":{"rendered":"\n

Originally published on 2016-07-28; fully revised and updated.<\/em><\/p>\n\n\n\n

This guide helps DevOps and platform teams evaluate open source team chat options that can be self-hosted or adapted to internal requirements. You will get a side-by-side comparison of IRC, Let\u2019s Chat, Mattermost, and Rocket.Chat, plus a practical workflow for selecting and piloting a tool.<\/p>\n\n\n\n

\"Open<\/a><\/figure>\n\n\n\n

Slack as the baseline<\/h2>\n\n\n\n

The original post used Slack<\/a> as the reference point: searchable channels, private groups, direct messages, file sharing, and broad third-party integrations. That baseline is useful because most alternatives are judged on the same needs: team communication, discoverability, integrations, and operational control.<\/p>\n\n\n\n

Open source alternatives compared<\/h2>\n\n\n\n
Option<\/th>What it is<\/th>Notable strengths (from original sources)<\/th>Trade-offs to evaluate<\/th>Official links<\/th><\/tr><\/thead>
IRC<\/td>Long-standing chat protocol with many open source client\/server implementations<\/td>Widely available clients across platforms; familiar in many open source communities<\/td>Modern features can be limited or inconsistent across servers (security, identity, rich media, logging via bots)<\/td>Overview<\/a>Demo link from original post<\/a><\/td><\/tr>
Let\u2019s Chat<\/td>Persistent messaging app built on Node.js and MongoDB<\/td>Positioned for small teams; MIT license; LDAP\/Kerberos auth; REST-like API; XMPP support<\/td>Validate current maintenance and ecosystem fit before adoption<\/td>Project page<\/a>Wiki<\/a><\/td><\/tr>
Mattermost<\/td>Open source team communication platform<\/td>Described as production-ready; Golang and React stack; Linux binary; supports MySQL or PostgreSQL; MIT license<\/td>Confirm edition, deployment model, and feature requirements for your environment<\/td>Website<\/a><\/td><\/tr>
Rocket.Chat<\/td>Open source chat platform with broad collaboration features<\/td>Community-driven project; supports group messaging and video calls; positioned as cross-platform<\/td>Verify operational requirements and feature maturity against your use case<\/td>Website<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Decision workflow for tool selection<\/h2>\n\n\n\n
\nflowchart TD\n    A[Need team chat outside proprietary SaaS] --> B{Need modern collaboration features}\n    B -- no --> C[Consider IRC]\n    B -- yes --> D{Small team and lightweight setup priority}\n    D -- yes --> E[Evaluate Lets Chat]\n    D -- no --> F{Need production oriented self hosted stack}\n    F -- yes --> G[Evaluate Mattermost]\n    F -- no --> H[Evaluate Rocket Chat]\n    C --> I[Run pilot and security review]\n    E --> I\n    G --> I\n    H --> I\n<\/pre>\n\n\n\n
Example: run a short technical pilot<\/h2>\n\n\n\n
Use a time-boxed pilot to reduce migration risk. The commands below are an evaluation pattern<\/em>, not product-specific installation instructions.<\/p>\n\n\n\n
  • Check project activity and maintenance signals.<\/li>
  • Deploy one candidate at a time in an isolated environment.<\/li>
  • Test SSO\/LDAP, backups, retention, and upgrade workflow.<\/li>
  • Score usability for developers, SREs, and non-technical users.<\/li><\/ul>\n\n\n
    for<\/span> repo in sdelements\/lets-chat mattermost\/mattermost RocketChat\/Rocket.Chat; do<\/span>\n  echo<\/span> \"=== $repo ===\"<\/span>\n  curl -s \"https:\/\/api.github.com\/repos\/$repo\"<\/span> | jq '{full_name, archived, pushed_at, open_issues_count}'<\/span>\n  echo<\/span>\ndone<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n
    services:\n  chat_app:\n    image: your-chat-image\n    ports<\/span>:\n      - \"3000:3000\"<\/span>\n    environment<\/span>:\n      - CHAT_DB_URL=postgres:\/\/chat:change_me@db:5432\/chat<\/span>\n    depends_on:\n      - db\n\n  db<\/span>:\n    image: postgres\n    environment<\/span>:\n      - POSTGRES_USER=chat\n      - POSTGRES_PASSWORD=change_me\n      - POSTGRES_DB=chat\n    volumes<\/span>:\n      - chat_db_data:\/var\/<\/span>lib\/postgresql\/data\n\nvolumes<\/span>:\n  chat_db_data:<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
    For production, always use each project\u2019s official installation and hardening documentation rather than a generic compose file.<\/p>\n\n\n\n
    Best practices before production rollout<\/h2>\n\n\n\n
    • Validate identity and access early:<\/strong> SSO, LDAP\/Kerberos, role mapping, and account lifecycle.<\/li>
    • Plan data governance:<\/strong> message retention, auditability, exports, and legal requirements.<\/li>
    • Treat chat as critical infrastructure:<\/strong> backups, restore drills, monitoring, and upgrade runbooks.<\/li>
    • Pilot with real workflows:<\/strong> incident response, on-call handoffs, and CI\/CD notifications.<\/li>
    • Confirm project health:<\/strong> release cadence, maintainer activity, and documentation quality.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"
      If you want Slack-like team communication with more control, these four open source options are a practical starting point. This guide compares their strengths, trade-offs, and how to run a short technical pilot.<\/p>\n","protected":false},"author":1,"featured_media":3047,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[49],"tags":[1144,1147,1146,1149,1153,1154,1155,666,1152,1156,1145,1150,1151,854,1157,1148,311,637],"class_list":["post-485","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-alternative","tag-chat","tag-collaboration","tag-instant-chat","tag-irc","tag-lets-chat","tag-mattermost","tag-open-source","tag-options","tag-rocket-chat","tag-slack","tag-slack-alternatives","tag-slack-alternatives-tools","tag-team","tag-team-collaboration-tools","tag-team-communication","tag-tools","tag-top"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/485","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=485"}],"version-history":[{"count":4,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/485\/revisions"}],"predecessor-version":[{"id":79366,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/485\/revisions\/79366"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/3047"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}