Best open-source AI tools (2026)

Open source means you can inspect it, self-host it and avoid vendor lock-in. These are the highest-rated open-source tools across every category in our directory.

1. 1

   n8nFreemiumAPIOpen source

   Fair-code workflow automation with native AI nodes

   • Self-hostable and source-available
   • 400+ integrations
   • Native LangChain and AI nodes

   Full reviewCompare with Stability AI
2. 2

   Stability AIFreemiumAPIOpen source

   Enterprise-ready creative partner delivering professional-grade generative AI tools for media production

   • Offers diverse Generative AI models across modalities including image, video, 3D, and audio.
   • Achieved SOC 2 Type II and SOC 3 compliance, validating security controls through third-party auditing.
   • Provides a commercial-safe platform with Brand Studio for end-to-end creative production.

   Full reviewCompare with Continue
3. 3

   ContinueFreemiumOpen source

   An open-source AI coding agent designed to amplify developer workflows

   • An open-source codebase that serves as a foundation for AI developer tooling.
   • Focuses on amplifying developers, ensuring they are empowered rather than automated.
   • Customers retain full ownership of their Customer Content under the Terms of Service.

   Full reviewCompare with Reflect
4. 4

   ReflectPaidOpen source

   A beautifully minimalist note-taking app designed to mirror the way you think, now with native AI integration.

   • Note contents are completely secured via local end-to-end encryption, preventing even the company from reading them.
   • Natively integrates top-tier AI models including GPT-4, Whisper, Gemini, and Claude Sonnet 3.7.
   • Core code is open-source, markdown-first, and works seamlessly with local SQLite-powered performance optimizations.

   Full reviewCompare with aider
5. 5

   aiderFreeOpen source

   AI pair programming in your terminal

   • Runs directly in your terminal, acting as an AI pair programmer.
   • Entirely open source, enabling users to audit the source code including analytics.
   • Automatically creates a compact repository map to provide contextual relevance to LLMs.

   Full reviewCompare with Resemble AI
6. 6

   Resemble AIFreemiumAPIOpen source

   Complete Generative AI Security: Detect, Verify & Generate with Voice AI

   • Enables high-accuracy voice cloning from as little as a 10-second audio sample.
   • Integrates an automated bot to monitor and detect deepfakes in real time on Zoom, Teams, Meet, and Webex.
   • Provides multi-platform deployment choices including cloud, on-premises, and air-gapped options.

   Full reviewCompare with Flowise
7. 7

   FlowiseFreemiumAPIOpen source

   Open source generative AI development platform for building AI agents, LLM orchestration, and more

   • Open source code remains available on GitHub under the Apache 2.0 license, allowing users to fork and continue development.
   • Enables visual building of AI agents and workflows using modular building blocks.
   • Supports building multi-agent systems with workflow orchestration distributed across multiple coordinated agents.

   Full reviewCompare with Upscayl
8. 8

   UpscaylFreemiumOpen source

   The #1 Free and Open Source AI Image Upscaler for Linux, MacOS, and Windows

   • The desktop application is completely free, open-source, and yours forever.
   • Desktop processing is done locally on your machine, eliminating the need for an active internet connection.
   • Upscayl is cross-platform, natively supporting Linux, MacOS, and Windows.

   Full review