Best Open Source Tools of July 2026

1. 1

   1. OpenSEO

   908 upvotes

   The open source Ahrefs alternative

   Without good data, your agent gives generic advice. Keyword research, competitor research, backlinks and site audits, starting at $10/month instead of a $100-plus monthly subscription. Connect with MCP so that you can work with your agent…

   #1 on July 19, 2026YC F26openseo.so1 maker, 1 with an email
2. 2

   2. Sim

   559 upvotes

   Open-source workspace for AI agents and workflows

   Sim is an open-source workspace to build agentic workflows. Connect your AI agents and workflows to 1,000+ integrations and LLMs.

   #2 on July 10, 2026YC X25sim.ai1 maker, 1 with an email
3. 3

   3. Osaurus

   522 upvotes

   Open source agents that run 100% locally on your Mac

   The native macOS harness for AI agents. Any model, persistent memory, autonomous execution, cryptographic identity. Built in Swift. Fully offline. Open source.

   #2 on July 13, 20261 maker
4. 4

   4. Kimi K3

   435 upvotes

   The world's first open 3T-class model

   Kimi K3 is the world's first open 3T-class model — frontier performance across coding, knowledge work, and reasoning, with native multimodality and 1M context.

   #3 on July 17, 2026kimik3.app1 maker
5. 5

   5. Claude Code usage tracking by LangWatch

   335 upvotes

   See what your Claude Code sessions actually cost

   Track Claude Code usage: cost, cache, session replay. Run `npx langwatch claude` once. Every session gets cost with cache reads/writes as separate token classes, every bash and MCP call as a span, theoretical vs billed for your Max plan…

   #4 on July 30, 2026langwatch.ai1 maker
6. 6

   6. PgDog

   225 upvotes

   Scale PostgreSQL without changing your app

   PgDog is an open source connection pooler, load balancer, and sharding proxy for PostgreSQL. It's Postgres-compliant, fast, secure and built in the open by a community of database engineers.

   #4 on July 14, 2026YC X25pgdog.dev1 maker, 1 with an email
7. 7

   7. BaseRT

   220 upvotes

   6.4x faster than llama.cpp, 3.9x faster than MLX

   BaseRT is the fastest LLM runtime on Apple Silicon. Install it with one command and run local models on your own device.

   #4 on July 19, 20261 maker
8. 8

   8. Greplica

   177 upvotes

   Self updating wiki for coding agents

   Greplica gives your engineering team and every coding agent a shared memory of the codebase. It continuously extracts decisions, constraints, gotchas, failed approaches, and file-level context from coding sessions, then retrieves only…

   #7 on July 30, 20261 maker
9. 9

   9. Portero

   165 upvotes

   Know exactly what's running on every port of your Mac

   Portero is a free, open source Mac app that shows every open port and the process behind it. See what's running, kill processes on busy ports, fix 'address already in use' errors, and block ports with the built-in macOS firewall.

   #6 on July 14, 2026portero.ai1 maker
10. 10

    10. Ycode AI Agents

    158 upvotes

    Build websites with AI

    Connect Claude, OpenAI, Gemini or Grok to Ycode and use your preferred AI directly inside the website builder. Describe what you want to change, and the agent can update designs, manage CMS content, and build or improve components for you

    #6 on July 28, 20261 maker
11. 11

    11. agentOS

    150 upvotes

    254× cheaper sandbox alternative, powered by WebAssembly

    Give agents a Linux operating system as a library – no sandboxes, VMs, or SaaS. Built on WebAssembly, the same tech powering Cloudflare Workers and Chrome. Support Claude Code, Codex, OpenCode, Pi, Eve, and Flue.

    #10 on July 30, 20261 maker
12. 12

    12. LongCat-2.0

    148 upvotes

    1.6T MoE trained entirely on AI ASICs

    LongCat-2.0 is an MIT-licensed 1.6T-parameter MoE model with ~48B active parameters, 1M context, LongCat Sparse Attention, and post-training for coding and agentic workflows. It was trained on AI ASIC superpods and integrates with Claude…

    #10 on July 7, 2026
13. 13

    13. Arkor

    143 upvotes

    Fine-tune and Deploy Open-weight Models in TypeScript

    Start a real LLM training in 10 minutes. Tell Claude Code or Codex what the model is for; they prepare the datasets and create the training project. Click "Run Training" in the local studio. Arkor runs the training, and deploys the…

    #10 on July 22, 20261 maker
14. 14

    14. Nixmac

    141 upvotes

    Nix-darwin that speaks plain English

    nixmac turns your Mac into a reproducible, version-controlled system. Describe what you want in plain English — it writes the Nix, builds it, and applies it safely.

    #10 on July 6, 2026nixmac.com1 maker, 1 with an email
15. 15

    15. AI YC interview with Gstack agents

    122 upvotes

    AI specialists that join your Google Meet and gives feedback

    Garry Tan's open-sourced gstack specialists — CEO, CSO, QA Lead, a YC-office-hours partner and 15 more — join your real Google Meet as voice bots with 3D avatars. They open in-persona, take turns, critique your shared screen out loud, and…

    #10 on July 27, 20261 maker
16. 16

    16. NanoKVM-Go

    116 upvotes

    Give your AI agent physical control over any screen

    NanoKVM-Go is a watch-sized, serverless 4K KVM with WiFi 6 and built-in Tailscale. It acts as an open MCP server to give AI agents hardware-level screen visibility and keyboard/mouse input control over any connected laptop or mobile device.

    #14 on July 8, 20261 maker
17. 17

    17. Redential

    116 upvotes

    A developer credential that proves what you built, NDA safe.

    Your best work is probably under an NDA, so nobody can see it. Nobody trusts CVs anymore, they are so fakeable. Redential reads your git history on your own machine and turns it into a profile of what you actually built. Never your code…

    #13 on July 22, 2026redential.com1 maker, 1 with an email
18. 18

    18. AgentLoop

    99 upvotes

    Starts a fresh Codex worker and critic every cycle

    Unlike long-running agent chats, AgentLoop starts a fresh Codex worker and critic every cycle. Set the goal and GUIDELINES.md rubric once; workers build, critics test, and failures become concrete fix notes for the next clean context.…

    #19 on July 23, 20261 maker
19. 19

    19. TraceLLM

    99 upvotes

    OpenTelemetry for production AI applications

    Tracellm is an observability platform for production AI applications. Monitor prompt execution, token consumption, latency, spans, errors, and model calls across your LLM workflows. Export traces using OpenTelemetry (OTLP) and quickly…

    #11 on July 31, 20261 maker
20. 20

    20. Cynative Security Research Agent

    96 upvotes

    Ask your cloud anything without breaking prod. Read-only.

    Open-source AI CLI that answers security questions across cloud, code and runtime - GitHub, GitLab, AWS, GCP, Azure, K8s. Ask in plain language: "what's publicly exposed that shouldn't be?" or "can my CI escalate to cloud admin?".…

    #17 on July 27, 20261 maker
21. 21

    21. Livinity

    91 upvotes

    Open-source homeserver OS with a built-in AI agent

    One operating system, one quiet interfacTurn a spare PC into a private AI homeserver. 495+ one-click Docker apps, plus Liv, an AI agent with MCP that installs apps and runs your containers for you. Bring your own Claude or Gemini key.…

    #27 on July 1, 2026livinity.dev
22. 22

    22. Caw

    80 upvotes

    Open source web terminal multiplexer for AI agents

    Caw is a web terminal multiplexer for OpenCode, Claude Code, Codex, Copilot, Antigravity, and Pi. It makes it easy to monitor and interact with multiple agent sessions from anywhere, especially on mobile. Besides the terminal multiplexer…

    #28 on July 23, 20261 maker
23. 23

    23. GTA DataCity

    80 upvotes

    San Francisco co-working dataset visualized, as a game!

    A tiny 3D platformer atlas of San Francisco's AI coworking spaces.

    #25 on July 23, 20261 maker
24. 24

    24. Inbix

    75 upvotes

    Cloudflare-native Email Infrastructure for Developers

    Inbix is an open-source, Cloudflare-native email infrastructure platform built for developers. Create disposable inboxes, receive emails in real time, automate workflows with webhooks, and integrate seamlessly using REST APIs, SDKs, and…

    #31 on July 16, 2026inbix.xyz1 maker, 1 with an email
25. 25

    25. Polygres

    57 upvotes

    Turn your entire database into a context window for AI

    Polygres turns Postgres into working memory for AI agents. Retrieve structured rows, connected relationships, semantic matches, and full-text results through one hybrid API. All without a separate vector store, graph database, or sync…

    #13 on July 31, 2026polygres.com1 maker, 1 with an email

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 July 2026 and ranks them by their upvotes. It refreshes daily.

• Best Productivity Tools290
• Best Design Tools74
• Best Developer Tools61
• Best Mac Apps51
• Best Android Apps49
• Best Marketing Tools47
• Best AI Tools45
• Best SaaS Tools44
• Best iOS Apps35
• Best APIs36
• Best Chrome Extensions32
• Best Analytics Tools27
• Best Health & Fitness Apps30
• Best Social Media Tools25
• Best Sales Tools30
• Best Fintech Tools19

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

What was the top Open Source launch of July 2026?

OpenSEO ("The open source Ahrefs alternative"), with 908 upvotes on July 19, 2026, where it finished #1 of the day.

How many Open Source Tools launched in July 2026?

58 on Product Hunt, with 5,758 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 (23 makers across this list). Junior adds their verified work emails, LinkedIn and X profiles for subscribers.