{"category":{"slug":"open-source-team-communication","label":"Open-source team communication tools"},"methodology_url":"https://www.orbator.io/ai-index/methodology","license":"Free to use with attribution to orbator.io","date":"2026-06-23","engine":null,"available_dates":["2026-08-15","2026-08-09","2026-08-08","2026-08-07","2026-07-29","2026-07-26","2026-07-25","2026-07-22","2026-07-21","2026-07-02","2026-07-01","2026-06-23","2026-06-17","2026-06-16"],"policy":{"quotable_engines":["anthropic","openai","gemini"],"max_excerpt_chars":400,"full_text_public":false,"customer_runs_public":false,"full_text_retention":"retained at least 24 months, then operator review","notes":["Only Index category runs are archived publicly — customer scans never appear.","The quotable unit is a short excerpt of at most 400 characters, never the full answer.","Engines outside the verbatim allowlist are recorded as having answered, with the excerpt withheld under their terms.","Prompt intent is published; the prompt text itself is not."]},"status":"ok","count":2,"limit":50,"truncated":false,"engines":[{"engine":"gemini","count":2,"withheld":false,"answers":[{"engine":"gemini","answered_on":"2026-06-23","prompt_intent":"best_in_category","excerpt":"For companies seeking an open-source team messaging platform that can be self-hosted, several robust options offer features comparable to popular proprietary solutions like Slack and Microsoft Teams, while providing greater control over data and infrastructure. The top recommendations include Rocket.Chat, Mattermost, Zulip, and Element (Matrix).\n\nHere's a breakdown of leading open-source, self-hos","excerpt_withheld":false,"withheld_reason":null,"highlights":[{"start":294,"end":305,"name":"Rocket.Chat"},{"start":307,"end":317,"name":"Mattermost"},{"start":319,"end":324,"name":"Zulip"},{"start":330,"end":337,"name":"Element"},{"start":339,"end":345,"name":"Matrix"}]},{"engine":"gemini","answered_on":"2026-06-23","prompt_intent":"best_in_category","excerpt":"For teams seeking a self-hosted alternative to Slack that provides greater control over data and infrastructure, several robust options offer comparable features and enhanced security. The top contenders consistently mentioned for their self-hosting capabilities include Mattermost, Rocket.Chat, Zulip, and Element (Matrix).\n\nHere's a breakdown of leading self-hosted Slack alternatives:\n\n*   **Matte","excerpt_withheld":false,"withheld_reason":null,"highlights":[{"start":271,"end":281,"name":"Mattermost"},{"start":283,"end":294,"name":"Rocket.Chat"},{"start":296,"end":301,"name":"Zulip"},{"start":307,"end":314,"name":"Element"},{"start":316,"end":322,"name":"Matrix"}]}]}]}