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.

92 visits Apr 29, 2025 Details

Apple Java support

apple.com

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

340 visits Aug 4, 2025 Details

BeKaffe

bekaffe.sourceforge.net

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

24 visits Feb 10, 2025 Details

ElectricalFire

mozilla.org

A Java Virtual Machine (JVM) that supports Just In Time (JIT) compiling. [Open Source, MPL].

330 visits Jul 29, 2023 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]

386 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]

386 visits Nov 17, 2025 Details

GNU Classpath Extensions

gnu.org

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

404 visits Nov 13, 2024 Details

Ground work laid for Open Source Java

theregister.co.uk

Sun Microsystems backed industry body, Java Community Process (JCP) oversees development of platform and language, voted to alter community structure, officially supporting OSS imp…

188 visits Jan 1, 2026 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]

438 visits Jun 8, 2025 Details

Java/Kaffe for Amiga Computers

ringlord.com

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

223 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 …

163 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]

283 visits Sep 8, 2025 Details

JJOS (jJOS/decaf)

sourceforge.net

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

5 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…

116 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).…

395 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]

30 visits Aug 25, 2024 Details

LaTTe

latte.snu.ac.kr

Java VM Just-in-Time Compiler, only for Solaris 2.5+ running on UltraSPARCs. Partially supports JDK1.1, but no AWT or Swing, and no bytecode verifier. [Open Source, BSD-like]

237 visits Jun 21, 2024 Details

NewMonics, Inc

newmonics.com

Provider of embedded and realtime JVMs. Provides news and evaluation kit download.

147 visits Jan 17, 2026 Details

Open JVM Integration

mozilla.org

Extending the Mozilla plug-in architecture to allow Java virtual machines to be plugged into Mozilla-based browser releases. [Open Source, MPL]

11 visits Feb 26, 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 …

360 visits Oct 11, 2024 Details

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