Dev tools · alternatives · 2026

24 alternatives to Fugu

Open source, on-premise, Slack alternative

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier. Fugu launched in 2021; newer entries below may have overtaken it.

1. 1
   Sakana Fugu▲156

   One Model to Command Them All

   Jun 2026 · sakana.ai · its alternatives →

2. 2OS
   Open-Source, Free, Agile Project Management Tool▲436

   2014 · taiga.io · its alternatives →

3. 3
   Slack▲2,714

   Be less busy. Real-time messaging, archiving & search.

   2013 · slack.com · its alternatives →

4. 4
   Runbear▲506

   Your best new hire, but AI — in Slack!

   2025 · runbear.io · its alternatives →

5. 5OS
   Open-Source Alternative to Intercom, Drift, Zendesk, FreshChat▲417

   2019 · github.com · its alternatives →

6. 6
   Jellybean▲484

   Run employee benefits, perk & reward programs on Slack

   2023 · its alternatives →

7. 7
   OpenSauced▲382

   Optimize your Open Source project with deep insights

   2023 · its alternatives →

8. 8
   Shaka▲269

   Tools to create thriving workplace culture in Slack & Teams

   2023 · its alternatives →

9. 9
   Zazu▲193

   Open source launcher, an alternative to Alfred

   2017 · its alternatives →

10. 10
    Switchfree▲520

    Bring any AI agent into Slack, Teams & Discord. Open-source.

    16d ago · flintai.dev · its alternatives →

11. 11SM
    Slack Meets GitHub Issues▲373

    Last year I gave in to the temptation of doing my own startup and quit my job, just like many others have done on this site. Since then, I’ve severely changed my lifestyle and reduced my living costs to a crazy low figure and worked my ass off for the last 8 months to achieve this: www.openloopz.com I have written more about it on Medium here: http://goo.gl/JN03yf I knew from the start the odds were stacked against me. I’m almost 36, I have a family and I live in the North East of England where - without wanting to sound negative - the opportunities are few and far between…

    2015 · its alternatives →

12. 12OO
    Openkoda – Open–source, private, Salesforce alternative▲318

    2024 · github.com · its alternatives →

13. 13
    Undaku▲128

    ‘SaaS’-iest open-source no-code platform

    2022 · its alternatives →

14. 14FP
    Fossfox – paid opportunities for open-source devs▲235

    The index lists either companies that work on open-source products or those that heavily contribute to open-source. Either way, ideal for devs that want to keep an eye out for opportunities. Engineering teams can post for free. Open directory of available positions is here [0]. [0] https://github.com/fossfox-com/fossfox

    2023 · fossfox.com · its alternatives →

15. 15GF
    Gurlic – Free and Open Communities▲108

    2020 · gurlic.com · its alternatives →

16. 16
    360Katas▲106

    Open source app to seek feedback from co-workers on Slack!

    2020 · its alternatives →

17. 17
    Slack Vibe 🎉▲106

    Open source analytics for Slack

    2020 · its alternatives →

18. 18
    Fluxer▲154

    Open-source Discord-like instant messaging & VoIP platform

    Jan 2026 · fluxer.app · its alternatives →

19. 19
    Papercups 2.0▲287

    Open source Intercom and Drift alternative

    2021 · its alternatives →

20. 20
    CopilotKit▲258

    Open-source platform for in-app AI chatbots and AI Textareas

    2023 · its alternatives →

21. 21
    Fosshub▲79

    An open source for free and open source tools

    2015 · its alternatives →

22. 22RA
    Run any GitHub Action locally from your Cron job -- finally!▲25

    Oct 2025 · docs.dagu.io · its alternatives →

23. 23GA
    Geppetto, an open source AI companion for your Slack teams▲57

    Our team just published Geppetto. Geppetto is an open source Slack App to use ChatGPT inside your workspace. It is written in Python and super easy to tinker and fork: - GitHub: https://github.com/Deeptechia/geppetto - Our first public release: https://deeptechia.io/blog/geppetto-ai-companion-for-slack/

    2024 · github.com · its alternatives →

24. 24
    OpenYak▲114

    The open-source Claude Desktop with any model you want

    Apr 2026 · open-yak.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →