Best Open Source Tools of October 2026

1. 1

   1. /dev/null

   490 upvotes

   a social network for devs

   /dev/null started as a live stream from the JetBrains office. On Oct 15, 2026, Nuno Maduro, Brent Roose, Matthieu Napoli, and Pauline Vos built a social network for web developers from scratch in 48 hours, in the open. Sign in with…

   #1 on October 20, 20261 maker
2. 2

   2. OpenSEO

   408 upvotes

   The open source Semrush alternative

   Without good data, your agent gives generic advice. We provide the data, tools, and integrations your AI agent needs for SEO via MCP. Regular SEO is the foundation of good GEO, but we just released a new set of AI Visibility features as…

   #2 on October 8, 2026openseo.io1 maker
3. 3

   3. Opengeni

   335 upvotes

   Ship AI agents within minutes. Infrastructure for Agents

   Ship AI agents to production in hours. Opengeni gives you sessions that recover from failures, isolated sandboxes, 100+ integrations, human approvals, and visibility into every step and dollar spent. Focus on your agents. We handle the…

   #4 on October 5, 2026opengeni.ai1 maker
4. 4

   4. Harness by Autonomous

   324 upvotes

   Every coding agent, every machine, one command center.

   Harness is the open-source command center for coding agents. Claude Code at work, Codex at home, Hermes in the cloud: every agent on every machine, side by side. Use the native desktop app, hn in your terminal, or the iOS and Android app…

   #2 on October 16, 2026autonomous.ai1 maker
5. 5

   5. OpenCode 2.0

   313 upvotes

   The open source AI coding agent

   OpenCode is an open source AI coding agent. It’s available as a terminal-based interface, desktop app, or web app.

   #2 on October 13, 2026YC W21opencode.ai1 maker
6. 6

   6. AUDR by Chargebee

   297 upvotes

   Open standard for tracking agent run costs

   AUDR (Agent Usage Detail Record) is an open standard, for capturing who initiated an agent run and what it cost across every system that run touches. Inspired by the telecom industry's Call Detail Record, AUDR defines a common JSON schema…

   #3 on October 6, 2026chargebee.com1 maker, 1 with an email
7. 7

   7. NitroStack

   255 upvotes

   Build, test, and deploy MCP servers in one place

   NitroStack is the full-stack platform for building production-ready MCP servers and AI apps. Build with open-source TypeScript & Python SDKs, test and debug visually in NitroStack Studio, orchestrate agent workflows with NitroStack…

   #1 on October 17, 2026nitrostack.ai10 makers, 9 with emails
8. 8

   8. Databench by Alkera

   234 upvotes

   Open-source collaborative agentic workspace for data teams

   Databench by Alkera is the open-source, multiplayer workspace for data science, analytics, and engineering. Collaborate live alongside teammates and agents in notebooks and chats, run any cell or agent on your laptop, another computer, or…

   #4 on October 7, 2026YC S26alkera.ai1 maker, 1 with an email
9. 9

   9. guilds.run

   197 upvotes

   Create multi-agent workflows that you can trust

   Open-source AI agent teams you can actually inspect. Debug every prompt, tool call, memory change, and agent interaction. Control permissions, edit context, and choose the model for each agent. Self-host for free. Stop guessing what your…

   #4 on October 12, 2026guilds.run1 maker
10. 10

    10. Harness²

    196 upvotes

    Harness the agent. Then harness its self-improvement.

    Harness² from Google Research is a plug-and-play recursive agent harnessing framework that lets LLM agents automatically evolve their execution harnesses (prompts, tools, memory) for open-world tasks—without ground-truth verifiers. Dual…

    #4 on October 20, 20261 maker
11. 11

    11. Blume 2.0

    196 upvotes

    The open-source docs framework for humans and agents

    Fast, AI-ready, and zero-config. Drop Markdown into a folder and ship a production-grade docs site with no app boilerplate to write or maintain. Free and open source, forever.

    #4 on October 4, 20261 maker
12. 12

    12. Hoistbay

    195 upvotes

    Open-source desktop app for Amazon S3 and CloudFront

    Hoistbay is a free desktop app for macOS and Windows that takes the repetitive work out of S3 and CloudFront. Set header rules once (Cache-Control, Content-Type, Content-Encoding by file pattern) and they apply on every upload. Download…

    #3 on October 20, 2026hoistbay.app1 maker, 1 with an email
13. 13

    13. shim-cli

    194 upvotes

    See what your coding agent sends. Mask what you can.

    An open-source hook and local proxy for Claude Code, Codex, Copilot CLI and VS Code. In Claude Code it masks secrets and personal data in tool results before the model reads them, and shim watch shows what a session sent and cost. No…

    #3 on October 18, 20261 maker
14. 14

    14. Together Link

    188 upvotes

    Use open models in your harness

    Together Link connects coding agents to open models on Together AI, letting developers keep their existing tools and workflows while reducing model costs.

    #4 on October 9, 2026
15. 15

    15. OpenMuse

    185 upvotes

    Opensource, self hostable personal assistant for any harness

    OpenMuse is an open-source, self-hostable personal agent with its own browser, terminal, files, and persistent work. Ask for an outcome, watch it work, review actions, and come back to the result. Compatible with any agent harness.

    #5 on October 15, 20261 maker
16. 16

    16. Muse Gadgets

    181 upvotes

    Meta's open-source kit for building your own AI gadgets

    Muse Gadgets is Meta's open-source hardware toolkit for bringing Muse into the physical world. Connect an ESP32, Raspberry Pi, or Linux device to displays, microphones, speakers, buttons, sensors, and more, then let Muse interact through…

    #4 on October 3, 2026muse-gadgets.com
17. 17

    17. OpenScreen 2

    173 upvotes

    Record your demo and let your AI agent do the edits

    Record your screen and the demo looks great on the first take: zooms planned from your clicks, smooth cursor, 3D camera moves, cursor themes, backgrounds and webcam layouts. Then let your AI agent do the edit over MCP, or cut the video…

    #5 on October 11, 2026openscreen.com1 maker, 1 with an email
18. 18

    18. SuperCMO AI

    165 upvotes

    Open-source skills that turn your Claude into an AI CMO

    Open-source agent skills that turn Claude Code, Cursor or Codex into an AI CMO. Give your agent your website and it learns your brand. It studies your competitors' ads, ranks what you should test next, writes the copy for each platform…

    #6 on October 21, 20261 maker
19. 19

    19. HyperFrames Studio (Desktop)

    160 upvotes

    The First Video Editor built for Agents

    The first video editor built for agents - built by the team who open sourced HyperFrames at HeyGen Bring your favorite agent (either codex or claude code), HyperFrames Studio turn your coding agents into video editors, while you stay in…

    #7 on October 5, 20261 maker
20. 20

    20. Takes for Mac

    138 upvotes

    Record talking-head videos. Claude Code does the edit.

    A free, open-source Mac app for talking-head videos. A teleprompter that follows your voice, one-button recording of camera and screen, and every take in plain folders. Claude Code, on your own Claude plan, cuts the edit, makes the…

    #8 on October 13, 20261 maker
21. 21

    21. Beam

    136 upvotes

    Highly efficient agentic 501B parameter open model

    Beam is a sparse Mixture-of-Experts model with 501 billion total parameters, 23 billion active, built for coding, reasoning, and agentic workloads.

    #7 on October 19, 20261 maker
22. 22

    22. statusbar

    128 upvotes

    a statusbar for any terminal

    A status bar for any terminal.

    #7 on October 1, 2026statusbar.ai1 maker, 1 with an email
23. 23

    23. Asimov 1

    125 upvotes

    The most customizable humanoid robot you can buy

    Asimov 1 is a humanoid robot you can build a company on. Train it and shape it for whatever you're building. Bought by founders, researchers and developers in 20+ countries.

    #7 on October 20, 20261 maker
24. 24

    24. Clef

    119 upvotes

    Open-source decision models from Cloudflare

    Clef is a 27B multimodal model that turns a state and a schema of typed questions into decisions. It reads the state as text, JSON, images, or video, and returns a probability for every allowed option of every question in a single forward…

    #9 on October 2, 20261 maker
25. 25

    25. Cubicle

    117 upvotes

    A live office for your AI agents, read-only by design

    Watch Claude Code, Codex, Gemini CLI and Paperclip agents work in a live office: they sit down and type, raise a hand or line up at your desk when they need you, and go to the lounge when done. KPI board for your tasks, Telegram alerts…

    #6 on October 3, 2026cubicle.dev1 maker

Junior imports every day's Product Hunt leaderboard. Each launch is filed under the first topic its makers chose, so it appears in one category only. This list takes the Open Source launches dated in October 2026 and ranks them by their upvotes. It refreshes daily, so it will change until the month is over.

• Best Productivity Tools174
• Best Design Tools46
• Best Developer Tools51
• Best Mac Apps84
• Best Android Apps41
• Best Marketing Tools28
• Best AI Tools33
• Best SaaS Tools15
• Best iOS Apps34
• Best APIs23
• Best Chrome Extensions22
• Best Analytics Tools17
• Best Health & Fitness Apps10
• Best Social Media Tools11
• Best Sales Tools15
• Best Email Tools17

• All Open Source Tools732
• Every launch in October 2026
• All best-of lists

What was the top Open Source launch of October 2026?

/dev/null ("a social network for devs"), with 490 upvotes on October 20, 2026, where it finished #1 of the day.

How many Open Source Tools launched in October 2026?

95 on Product Hunt through October 23, 2026, with 10,269 upvotes between them. This list shows the 25 most upvoted.

How is this list ranked?

By Product Hunt upvotes, as recorded on launch day. Ties go to the launch with the better daily rank. Every launch is counted once, in the category its makers listed first.

How do I reach the makers of these Open Source Tools?

Each launch links to its page on Junior, with the people behind it (32 makers across this list). Junior adds their verified work emails, LinkedIn and X profiles for subscribers.