Browse free open source Build Tools and projects for Windows and Linux below. Use the toggles on the left to filter open source Build Tools by OS, license, language, programming language, and project status.

  • Gemini 3 and 200+ AI Models on One Platform Icon
    Gemini 3 and 200+ AI Models on One Platform

    Access Google's best plus Claude, Llama, and Gemma. Fine-tune and deploy from one console.

    Build generative AI apps with Vertex AI. Switch between models without switching platforms.
    Start Free
  • Forever Free Full-Stack Observability | Grafana Cloud Icon
    Forever Free Full-Stack Observability | Grafana Cloud

    Our generous forever free tier includes the full platform, including the AI Assistant, for 3 users with 10k metrics, 50GB logs, and 50GB traces.

    Built on open standards like Prometheus and OpenTelemetry, Grafana Cloud includes Kubernetes Monitoring, Application Observability, Incident Response, plus the AI-powered Grafana Assistant. Get started with our generous free tier today.
    Create free account
  • 1
    FIPA-OS is a component-based toolkit enabling rapid development of FIPA compliant agents. FIPA-OS supports the majority of the FIPA Experimental specifications (<a href="http://www.fipa.org">www.fipa.org</a>) and is being continuously improved.
    Downloads: 5 This Week
    Last Update:
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  • 2
    The "Business to Business Operating System" is a set of Java-based modules for providing auctions, catalogs, directories as an open-source alternative to B2B E-Marketplaces. The "operating system" aspect relates to the resource allocation capability.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 3
    FOOL is a Fuzzy system development tool with interactive 'foolproof' graphical user interface.
    Downloads: 0 This Week
    Last Update:
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  • 4
    Jamocha is an open source rule engine. The objective of Jamocha is to provide a high quality rule engine and expert system shell environment. We would provide you an engine, the required development tools and a best practice methodology.
    Downloads: 0 This Week
    Last Update:
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  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 5

    Ztooly

    Ztooly is a comprehensive collection of 50+ free online tools designed

    Ztooly is a comprehensive collection of 50+ free online tools designed to boost productivity and simplify everyday tasks. From AI-powered generators to image editing, data conversion, PDF handling, social tools, and more — Ztooly is your all-in-one web toolkit.
    Downloads: 0 This Week
    Last Update:
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