Browse free open source Java Compilers and projects below. Use the toggles on the left to filter open source Java Compilers by OS, license, language, programming language, and project status.

  • Gen AI apps are built with MongoDB Atlas Icon
    Gen AI apps are built with MongoDB Atlas

    Build gen AI apps with an all-in-one modern database: MongoDB Atlas

    MongoDB Atlas provides built-in vector search and a flexible document model so developers can build, scale, and run gen AI apps without stitching together multiple databases. From LLM integration to semantic search, Atlas simplifies your AI architecture—and it’s free to get started.
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  • Build Securely on AWS with Proven Frameworks Icon
    Build Securely on AWS with Proven Frameworks

    Lay a foundation for success with Tested Reference Architectures developed by Fortinet’s experts. Learn more in this white paper.

    Moving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
    Download Now
  • 1
    JSmooth creates standard Windows executable files (.exe) that smartly launch java applications. It makes java deployment much smoother and user-friendly, as it is able to find and run Java VMs by itself, or help the user get one if none are available.
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    Downloads: 103 This Week
    Last Update:
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  • 2
    Jad Java decompiler plugin for Eclipse IDE.
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    Downloads: 59 This Week
    Last Update:
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  • 3
    MAPLER- Compilador Portugol
    Este projeto visa o desenvolvimento e produção de uma ferramenta de compilação da pseudo-linguagem português estruturado (portugol) para auxliar estudantes brasileiros iniciando em atividades de programação.
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    Downloads: 52 This Week
    Last Update:
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  • 4
    Develop with Java 1.5, deploy native executables for windows, linux and mac! SWT, JFace, AWT and Swing is supported.
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    Downloads: 38 This Week
    Last Update:
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  • Build Securely on Azure with Proven Frameworks Icon
    Build Securely on Azure with Proven Frameworks

    Lay a foundation for success with Tested Reference Architectures developed by Fortinet’s experts. Learn more in this white paper.

    Moving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
    Download Now
  • 5
    z390 Portable Mainframe Assembler

    z390 Portable Mainframe Assembler

    z390 Portable Mainframe Assembler and Emulator

    z390 Portable Mainframe Assembler and Emulator
    Downloads: 12 This Week
    Last Update:
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  • 6
    HydraDragonAntivirus

    HydraDragonAntivirus

    Dynamic and static analysis with Sandboxie for Windows, including EDR

    Dynamic and static analysis with Sandboxie for Windows, including EDR, ClamAV, YARA-X, custom machine learning AI, behavioral analysis, NLP-based detection, website signatures, Ghidra, Suricata, Sigma, and much more than you can imagine
    Downloads: 16 This Week
    Last Update:
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  • 7
    jdec is a Java Decompiler. It can be used to reverse the bytecodes present in a .class File to produce a Java Source File which can be nearly correct or equivalent (Due To different Interpretations) to the original java file.[With UI & command line]
    Downloads: 3 This Week
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  • 8
    Compile your clarion source code into java runtime environment. Includes the compiler, 100% java based runtime implementation of the clarion runtime environment and other miscellaneous tools.
    Downloads: 2 This Week
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  • 9
    JavaGuard is a general purpose bytecode obfuscator, designed to fit effortlessly into your regular build and testing process, providing peace of mind that your valuable Java code is more secure against decompilation and other forms of reverse engineering
    Downloads: 2 This Week
    Last Update:
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  • Secure remote access solution to your private network, in the cloud or on-prem. Icon
    Secure remote access solution to your private network, in the cloud or on-prem.

    Deliver secure remote access with OpenVPN.

    OpenVPN is here to bring simple, flexible, and cost-effective secure remote access to companies of all sizes, regardless of where their resources are located.
    Get started — no credit card required.
  • 10
    An API and a graphical tool for inspection (viewing, searching and comparing) and manipulation (modification, obfuscation, refactoring of methods, fields, attributes and code) of classfiles for the Java platform.
    Downloads: 4 This Week
    Last Update:
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  • 11
    We extend the Eclipse IDE with tools for development in Haskell, a functional programming language, providing support for a wide range of tools (compilers, interpreters, doc tools etc.) in a coherent, convenient and configurable environment.
    Downloads: 1 This Week
    Last Update:
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  • 12
    Asterix IDE
    Asterix IDE (Integrated Development Environment) is especially designed to provide many languages supports in one IDE. Asterix IDE offers superior support for JAVA, C/C++(mingw32-g++) and HTML developers to write, compile and run their code at one place. Asterix IDE lets you quickly and easily make program with multiple programming language support. With its constantly improving Java Editor, many rich features and an extensive range of tools are provided. An IDE is much more than a text editor. Asterix IDE offers superior support for JAVA and HTML5 developers, providing comprehensive editors and tools. Asterix IDE can be installed on all operating systems that support Java, from Windows to Linux to Mac OS systems. Write Once, Run Anywhere, is as true for Asterix IDE as it is for your own applications, because Asterix IDE itself is written in Java, too!
    Downloads: 2 This Week
    Last Update:
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  • 13
    AL-IV

    AL-IV

    ALFOUR Programming language. Simple, safe, power, multi-platform.

    A programming language AL-IV (ALFOUR) is a high-level imperative object oriented programming language with minimal introduction level, easy porting to any platform claiming a very high level of safety and stability, with a controllable level of code protection, high efficiency of an executable code, full independence from a target platform, minimal enter level.
    Downloads: 3 This Week
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  • 14
    Decouple your GUI building code from the rest of your application. Using an XML description, the Java Gui Builder will build appropriate windows, controls and objects for later retrieval by the mainstream code.
    Downloads: 2 This Week
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  • 15
    Introspect on running programme, view and alter object fields and methods. Edit the code of any method at runtime; apply the changes to any combination of objects, such as an array, or a complete class. Complete rewrite underway available Jan 2007.
    Downloads: 2 This Week
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  • 16
    Compiler for java assembly to class file. This compiler contains dead code detection and allow creating method, field and constructor from a java assembly file
    Downloads: 1 This Week
    Last Update:
    See Project
  • 17
    CodePad.org

    CodePad.org

    android app for CodePad.org & ideone.com

    An android client of CodePad.org & ideone.com CodePad.org is an oneline free multi-language compiler for developers. ideone provide non-free services for the same work. ideone is much more powerful Now the tool support C,C++,Java (for ideone), Bash (for ideone), R (for ideone), Python, Ruby, Perl, PHP
    Downloads: 1 This Week
    Last Update:
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  • 18
    Compose* is a project that aims at enhancing the modularization capabilities of component- and object-based programming. In particular, Compose* offers aspect-oriented programming through the composition filters model.
    Downloads: 1 This Week
    Last Update:
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  • 19
    ECL is a system-level specification language for HW/SW designs and is based on Esterel and C. The ECL compiler parses ECL, writes Esterel and C, and uses the Esterel compiler to produce an implementation. Originally developed at Cadence Berkeley Labs.
    Downloads: 1 This Week
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  • 20
    Java AS400 RPG source code editor, debugger, IDE.
    Downloads: 1 This Week
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  • 21
    JTools provides some useful tools and utilities for Java 5.0 development. Beneath some smaller utilities we have: a (Ant like) DAO framework (also including XML Repository) and a (JSP like) general purpose template generator and execution framework.
    Downloads: 1 This Week
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  • 22
    JodeEclipse is a plugin for integrating the Jode Java Decompiler with the Eclipse IDE.
    Downloads: 1 This Week
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    See Project
  • 23
    OJ (f.a.k.a. OpenJava) is an object-oriented macro system with a compile time metaobject protocol for Java.
    Downloads: 1 This Week
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  • 24
    RunCC is a new kind of parsergenerator that generates parsers and lexers at runtime. Source generation is only optional. It features the absence of any cryptography. Although intended for small languages, it comes with Java and XML example parsers.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 25
    TreeDL (Tree Description Language) is a notation for tree structures used by programs (like syntax trees) and tool for translation of tree descriptions to target programming language, docs generation, etc. Tool's functionality can be extended by plugins.
    Downloads: 1 This Week
    Last Update:
    See Project
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