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.

  • Go From AI Idea to AI App Fast Icon
    Go From AI Idea to AI App Fast

    One platform to build, fine-tune, and deploy ML models. No MLOps team required.

    Access Gemini 3 and 200+ models. Build chatbots, agents, or custom models with built-in monitoring and scaling.
    Try Free
  • Secure File Transfer for Windows with Cerberus by Redwood Icon
    Secure File Transfer for Windows with Cerberus by Redwood

    Protect and share files over FTP/S, SFTP, HTTPS and SCP with the #1 rated Windows file transfer server.

    Cerberus supports unlimited users and connections on a single IP, with built-in encryption, 2FA, and a browser-based web client — all deployable in under 15 minutes with a 25-day free trial.
    Try for Free
  • 1
    RCXJavaC A Java like compiler for the Lego Mindstorms Robotics kit.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    RES is a pure Java based Open Source Cobol to Java translator. It creates maintainable Java code for a subset of VS Cobol syntax. It has been developed with JDK, JTB and Javacc.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3
    RSP is a retargetable language for writing web applications. A web application written in RSP can be compiled into either ASP, JSP or PHP code and then deployed to a web server.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    Recoder.C# is a Java framework for C# program analysis and source code transformation. It computes an easy to use syntactic and semantic program model containing cross references and supports transformation rollbacks and incremental model updates.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • 5
    Abacus Technologies Relational XQuery is an XQJ compatible XQuery processor that provides the ability to execute XQuery against both relational and XML data sources. Relational data can be transformed to any XML schema using XQuery's powerful features.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    RelaxNGCC is a tool for generating Java source code from a given RELAX NG grammar. By embedding code fragments in the grammar like yacc or JavaCC, you can take appropriate actions while parsing valid XML documents against the grammar.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    A Java bytecode weaver that enables you to take advantage of the new 1.5 language features in your source code, while still retaining compatibility with 1.4 virtual machines.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    This is a fork from retroweaver based on the 1.1 release. The modifications have been merged back into retroweaver and all future development will be done there. This project is now inactive.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    Rev = Really Easy Validation - write your form validation code once in this simple and powerful language that generates code for JavaScript, Perl, PHP, and Java. With Rev you get server side and client side data validation with no duplicated code.
    Downloads: 0 This Week
    Last Update:
    See Project
  • $300 in Free Credit Towards Top Cloud Services Icon
    $300 in Free Credit Towards Top Cloud Services

    Build VMs, containers, AI, databases, storage—all in one place.

    Start your project in minutes. After credits run out, 20+ products include free monthly usage. Only pay when you're ready to scale.
    Get Started
  • 10
    Ruby On Flash is a compiler written in Java that compiles Ruby source code directly into Flash applications(.swf files), and aims to provide a programmer-friendly approach to casual Flash game development.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    The aim of this project is to create a fully functional COBOL compiler that translate into Java or directly into bytecode.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    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: 0 This Week
    Last Update:
    See Project
  • 13
    This project is an attempt to design strongly typed langauge like C# or Java using capability security model. This is an reseach project. This project is also a temporary home for async-objects projects which is prototype of classes for asynchronous inte
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    A parsing toolkit that supports both top-down (LL(1) and Simple Precedence) and bottom-up parsing (LR(0), SLR(1), LR(1) and LALR(1)). The toolkit supports generating Java parsers for all the bottom-up parsing methods, based on a CUP definition.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    SMIng parser and API in java for the SMIng proposal available at : http://www.ietf.org/html.charters/sming-charter.html
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    OS based on Agent based Security with a new type of split kernel and agents platform.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    Picture Gallery viewable with HTML web browsers. All dynamics is implemented at client-side in JavaScript. This approach is useful when the server side is able to provide only static contents, or if the gallery is stored on CDROM or other media.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    STDL (Structured test description language) is a domain-specific testing language that is used to auto-generate unit test code. It supports a myriad of output languages (incl. C#). The project's aim is that of reducing the resources required for testing
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    SWRTJ
    SWRTJ (Sugared Welterweight Record-Trait Java) is a dialect of Java, where units of objects' functionality are modeled by traits and by records, which are assembled in classes that are instantiated (as usual) to build objects.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    Saffron is an extension to Java to incorporate SQL-like relational expressions. It features a pre-processor, a query optimizer, and a runtime library.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    The saturn programming language, an optionally typed modern object-oriented programming language based on C, Java and smalltalk.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    A set of Eclipse plugins for the Scheme programming language. Features a powerful, fully extensible S-expression-based editor. Integrates seamlessly with any Scheme interpreter.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    SecFlow - Secure Flow Analyzation for Java and .NET
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Small and easy Java-Compiler written in Java with Antlr.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Maven plugin for continuous integration of Adobe Flex applications.
    Downloads: 0 This Week
    Last Update:
    See Project
MongoDB Logo MongoDB