Implementations

Alternative Java Implementations

dwheeler.com

Article by David K. Friedman and David A. Wheeler. It briefly introduces Java, provides a bit of Java history, and describes various Java implementations.

93 visits Apr 29, 2025 Details

Apple Java support

apple.com

Apple's Java implementation. Currently supports JDK1.3 and native "Aqua" look and feel on MacOS X.

341 visits Aug 4, 2025 Details

BeKaffe

bekaffe.sourceforge.net

Port of Kaffe to the BeOS platform. [Open Source, GPL]

25 visits Feb 10, 2025 Details

GCJ

gcc.gnu.org

The GNU Compiler for Java - compiles Java source or bytecode to native machine code. Most APIs are supported, except the AWT and Swing. [Open Source, GPL]

387 visits May 31, 2025 Details

GNU Classpath

gnu.org

A free replacement for Sun's proprietary core Java class libraries. [Open Source, GPL with exception]

387 visits Nov 17, 2025 Details

GNU Classpath Extensions

gnu.org

A free replacement for the "javax.*" classes (core and otherwise); sibling project to GNU Classpath. [Open Source, GPL/LGPL]

405 visits Nov 13, 2024 Details

IBM Developer Kit Porting

-106.ibm.com

Provides free developer kits for creating and testing Java applets and applications on a number of platforms, including AIX and Linux. Also other Java tools. [Freeware]

439 visits Jun 8, 2025 Details

Java/Kaffe for Amiga Computers

ringlord.com

Information on getting Java (Kaffe) to run on Amiga computers.

224 visits Sep 25, 2024 Details

JC Virtual Machine

jcvm.sourceforge.net

A Java virtual machine implementation that converts class files into C source files using the Soot Java bytecode analysis framework, compiles them with GCC, and loads them using a …

164 visits Oct 6, 2025 Details

JDK 1.1.8 for NetBSD

ftp.netbsd.org

Contains releases of the Sun JDK version 1.1.8 for the NetBSD/i386 platform. [Freeware]

284 visits Sep 8, 2025 Details

JJOS (jJOS/decaf)

sourceforge.net

Combines the jJOS kernel and decaf virtual machine. [Open Source]

6 visits Jan 7, 2025 Details

JNBridge

jnbridge.com

Enabling the integration of pure Java into Microsoft .NET applications. Tools support J2SE or J2EE, allowing .NET code to access J2EE facilities including EJBs, and JNDI. SE (Stand…

117 visits Mar 13, 2026 Details

Kaffe JVM

kaffe.org

Java Virtual Machine. Works on many platforms and includes Just-In-Time (JIT) support for most of them. PersonalJava 1.1 compliant (but does not fully support the Java 2 Platform).…

396 visits Nov 5, 2025 Details

Kissme

kissme.sourceforge.net

Java VM for Unix, more so Linux. Native threads and JIT compiling. Uses GNU Classpath. [Open Source, GPL]

31 visits Aug 25, 2024 Details

Open Runtime Platform

sourceforge.net

Open source research infrastructure for dynamic compiling and memory management; supports programs compiled to bytecode and linked with GNU Classpath libraries. [SourceForge, Open …

361 visits Oct 11, 2024 Details

shuJIT

shudo.net

JIT plugin for the Sun JVM, for Linux and FreeBSD on x86 processors. Includes support for a transparent distributed object system, MetaVM. [Open Source, GPL]

205 visits Feb 15, 2025 Details

teaseme

teaseme.sourceforge.net

Java virtual machine (VM) that runs in Linux kernel, Linux kernel module JVM, based on JOS and kissme projects. [Open Source, GPL]

158 visits Mar 3, 2024 Details

Viva

viva.sourceforge.net

Open source implementation of the Java runtime. Includes links to other open source resources.

13 visits Oct 19, 2024 Details

Implementations

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