Open Source Java Runtimes
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Java Runtimes
View 6111 business solutionsBrowse free open source Java Runtimes and projects below. Use the toggles on the left to filter open source Java Runtimes by OS, license, language, programming language, and project status.
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Enterprise-grade ITSM, for every businessFreshservice is an intuitive, AI-powered platform that helps IT, operations, and business teams deliver exceptional service without the usual complexity. Automate repetitive tasks, resolve issues faster, and provide seamless support across the organization. From managing incidents and assets to driving smarter decisions, Freshservice makes it easy to stay efficient and scale with confidence.
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capacitor
Build cross-platform native progressive web apps for iOS and Android
Capacitor is an open source native runtime for building Web Native apps. Create cross-platform iOS, Android, and Progressive Web Apps with JavaScript, HTML, and CSS. Capacitor’s native plugin APIs make it extremely easy to access and invoke common device functionality across multiple platforms. Build web-based applications that run equally well across iOS, Android, and as Progressive Web Apps. Access the full Native SDKs on each platform, and easily deploy to the App Stores (and the web). Add custom native functionality with a simple Plugin API, or use existing Cordova plugins with our compatibility layer. Capture images, save photos, and configure hardware parameters like saturation and color balance. Save and read documents, assets, and other content your users need to access via native file systems. Gather critical information about a user’s device location, such as latitude and longitude. -
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RARS
RISC-V Assembler and Runtime Simulator
RARS, the RISC-V Assembler, Simulator, and Runtime, will assemble and simulate the execution of RISC-V assembly language programs. Its primary goal is to be an effective development environment for people getting started with RISC-V. -
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Speedment
Speedment is a Stream ORM Java Toolkit and Runtime
Speedment is an open-source Java Stream ORM toolkit and runtime. The toolkit analyzes the metadata of an existing SQL database and automatically creates a Java representation of the data model. This powerful ORM enables you to create scalable and efficient Java applications using standard Java streams with no need to type SQL or use any new API. Speedment was originally developed by researchers and engineers based in Palo Alto with the purpose to simplify and streamline the development of Java database applications by leveraging the Java Stream API. Speedment is licensed under the business-friendly Apache 2 license. Contribution from users is encouraged. Please feel free to request new features, suggest improvements and file bug reports. Assuming you have Maven installed and a relational database available, you can start using Speedment in a minute. Automatic Java representation of the latest state of your database eliminates boilerplate code and the need of manually writing Java. -
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Byte Buddy
Runtime code generation for the Java virtual machine
Byte Buddy is a code generation and manipulation library for creating and modifying Java classes during the runtime of a Java application and without the help of a compiler. Other than the code generation utilities that ship with the Java Class Library, Byte Buddy allows the creation of arbitrary classes and is not limited to implementing interfaces for the creation of runtime proxies. Furthermore, Byte Buddy offers a convenient API for changing classes either manually, using a Java agent or during a build. In order to use Byte Buddy, one does not require an understanding of Java byte code or the class file format. In contrast, Byte Buddy's API aims for code that is concise and easy to understand for everybody. Nevertheless, Byte Buddy remains fully customizable down to the possibility of defining custom byte code. Furthermore, the API was designed to be as non-intrusive as possible and as a result, Byte Buddy does not leave any trace in the classes that were created by it. -
Secure File Transfer for Windows with Cerberus by RedwoodCerberus 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.
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JetBrains Runtime
Runtime environment based on OpenJDK for running IntelliJ products
JetBrainsRuntime is the custom Java Runtime Environment (JRE) distribution maintained by JetBrains that enhances the standard OpenJDK to better support JetBrains products and provide a robust, optimized runtime for IDEs like IntelliJ IDEA, Rider, and other tools. It includes performance-tuned garbage collectors, desktop integration fixes, font rendering improvements, enhanced GTK support on Linux, and additional patches not available in stock JDK builds to ensure smoother, more stable behavior for large-scale IDE usage. These modifications are aimed at reducing resource consumption, improving windowing and high-DPI rendering, and delivering a consistent user experience across operating systems. By controlling the runtime environment, JetBrains can ship their IDEs with confidence that core JVM behavior will align with expected performance, reducing platform-specific issues and enhancing responsiveness. -
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GraalVM
Run programs faster anywhere
GraalVM is a high-performance multilingual runtime. It is designed to accelerate the execution of applications written in Java and other JVM languages while also providing runtimes for JavaScript, Ruby, Python, etc. Increase application throughput and reduce latency. Compile applications into small self-contained native binaries. Seamlessly use multiple languages and libraries. Advanced optimizing compiler that generates fast lean code which requires fewer compute resources. Native binaries start up instantly and deliver peak performance with no warm up time. Leverage the best features and libraries of popular languages in a single app with no overhead. Debug, monitor, profile, and optimize resource consumption in Java and across multiple languages. Enterprise version provides all Community features along with higher performance and enhanced security. Additional ahead-of-time compilation optimizations and 24/7/365 support from Oracle. -
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J2ObjC
A Java to iOS Objective-C translation tool and runtime
J2ObjC is an open-source command-line tool from Google that translates Java source code to Objective-C for the iOS (iPhone/iPad) platform. This tool enables Java source to be part of an iOS application's build, as no editing of the generated files is necessary. The goal is to write an app's non-UI code (such as application logic and data models) in Java, which is then shared by web apps (using GWT), Android apps, and iOS apps. J2ObjC supports most Java language and runtime features required by client-side application developers, including exceptions, inner and anonymous classes, generic types, threads and reflection. JUnit test translation and execution is also supported. J2ObjC cannot convert Android binary applications. Developers must have source code for their Android app, which they either own or are licensed to use. -
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tjger - the java game & entertainment rt
the java game and entertainment runtime
Framework to implement board and card games including some already developed games. Typical game elements are offered by this library, so developers just care on the essential aspects that differ. Games created with tjger are also hosted (Four wins, Oasch, Schnapsen, Trap the Wizard, etc.) and the Tjger Game Pack contains all these games. -
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neoHort iText&OpenPdf&JExcel&ApachePOI
neoHort:Java PDF&XLSX runtime builder-based iText&JExcelAPI&Apache POI
neoHort: Java PDF&XLSX runtime builder. Based: iText 2.1.7, OpenPdf, JExcelAPI, POI libraries. Xml-based input source with integrated WebJava environment objects. Includes dynamical tag's structures. Demo https://neohort.herokuapp.com/ https://neohort4ape.appspot.com GitHub https://github.com/surban1974/neohort neoHort5 migrated to https://sourceforge.net/p/neohort5 Maven https://github.com/surban1974/neohort/blob/master/README.md -
Build Agents and Models on One PlatformGemini Enterprise Agent Platform is Google Cloud's comprehensive platform for developers to build, scale, govern, and optimize agents and models. Choose from Google's most advanced models and third-party models like Anthropic's Claude Model Family.
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Lightweight runtime monitor for AJAX web applications that checks in real time whether XML messages received and sent by the application satisfy a predefined interface specification. Complex message sequences and data values are supported.
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QueryObjectFactory (QOF) is a lightweight runtime JDBC byte-code generator providing support for CRUD (create, retrieve, update and delete) operations and stored procedure calls. It uses Java annotations to define mappings and is fully OSGi ready.
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Boot
Build tooling for Clojure
Boot is a Clojure build framework and ad-hoc Clojure script evaluator. Boot provides a runtime environment that includes all of the tools needed to build Clojure projects from scripts written in Clojure that run in the context of the project. Build processes for applications always end up being complex things. A simple web application, for instance, may require many integrations–asset pipelines, deployment to different environments, the compilation of multiple artifacts with different compilers, packaging, etc. The more complex the build process becomes, the more flexible the build tool needs to be. Static build specifications become less and less useful as the project moves toward completion. Being Lispers we know what to do: Lambda is the ultimate declarative. Instead of building the project based on a global configuration map, boot provides a runtime environment in which a build script written in Clojure can be evaluated. It is this script. -
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JSchemePlus
An hack of Jscheme with a lot of enhancements and additional features.
JSchemePlus is an hack of Jscheme 1.4 by Peter Norvig. It allows to redistribute a script in an executable JAR file of only ~40K and implements all of R4RS with a lot of additional functions, like: (execute command) (random) (sequence from up-to step) (split list element) (string-split string sub-string) (read-all-from-file file) (write-to-file file data) (file-size file) etc... For the complete list read the HELP file or type (help). JSchemePlus needs only the Java Virtual Machine (version 6 or higher) that, in the case, is very easy to download and install. -
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OpenPEARL
PEARL Compiler and Runtime System
PEARL is a high level procedural programming language, which was especially designed for the demanding need to have an expressive and comfortable language for solving multitasking problems when controlling technincal processes. PEARL is an abbreviation for "(P)rocess and (E)xperiment (A)utomation (R)ealtime (L)anguage". It was designed around 1975 at the IRT Institute of the Leibniz University in Hannover with the idea in mind to have an easy to learn programming language for realtime problems. For more, also historical information please visit (http://www.pearl90.de/). In 1998 PEARL-90 was standardized by the Deutsches Institut für Normung e.V. in DIN 66253-2. PEARL provides the standard data types and structures known from other procedural languages like e.g. PASCAL. Additionally PEARL brings special language constructs for managing real-time and multitasking tasks. -
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A software system will reasonable change its state during runtime. We call this system behavior, which can be described with UML2 state charts. The aim of Talante is to provide a code generator and a runtime platform to make UML2 state charts executable.
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Wheefun Properties Library for Java
A java library for binding runtime properties
This library allows for the programmer to bind arbitrary properties to types which can be accessed at runtime via reflection. Properties can be declared via annotation and later manipulated through a simple static interface; no special naming conventions are required and the properties can be bound to any method which has the appropriate signature. -
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dotNet4Java - .Net for Java
The best Java library to work with .Net libraries and frameworks.
The dotNet4Java is a .Net Runtime Library for Java which helps Java developers work with .Net framework and 3rd party libraries in Java with ease. It is designed to provide a way to interact with applications written in anyone of the .Net languages (such as C#, Visual Basic.Net, Delphi.Net, JScript.Net etc) from Java. Competitive Advantages: - dotNet4Java JAR can be easily added to artefacts repository like maven or ivy. - dotNet4Java is single jar file that can be very easily added to any type of Java project EJB, applet, desktop, console or service. - No extra dll is required when deployed. - Full access to .Net Framework Class Library. - Lightweight and easy to use. - There are tools to import and generate .Net Libraries into Java class files. dotNet4Java can do so much: - Access .Net Framework Class Library. - Access Third Party .Net Libraries. - Access Your .Net Libraries. - Can invoke members of a .Net types. - etc Latest Version: 1.0.1.0 -
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neoHort5 iText (v.5.*)&JExcel&ApachePOI
neoHort:Java PDF&XLS runtime builder-based iText(v.5.*)&JExcelAPI..
neoHort5:Java PDF&XLS runtime builder-based iText(v.5.*)&JExcelAPI library.Xml-based input source with integrated WebJava environment objects (beans e.c.)Include dynamical tag's structures: cycle,condition,e.c. Support iText 5.* Demo https://neohort4ape.appspot.com GitHub https://github.com/surban1974/neohort Maven <repositories> <repository> <id>neohort-mvn-repo</id> <url>https://github.com/surban1974/neohort/raw/mvn-repo/</url> <snapshots> <enabled>true</enabled> <updatePolicy>always</updatePolicy> </snapshots> </repository> </repositories> <dependency> <groupId>com.github.surban1974.neohort</groupId> <artifactId>neoHort5</artifactId> <version>5.2.8</version> </dependency> <dependency> <groupId>com.github.surban1974.neohort</groupId> <artifactId>neoHort5-poi-xlsx</artifactId> <version>5.2.8</version> </dependency> -
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Extensible framework that enables productive design, analysis, and execution of arbitrary-sized neural-networks or system on a distributed, scalable, high-throughput runtime platform. Enables synapse-oriented-programming.
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