Kaffe JVM
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). [Open Source, GPL]
JNBridge
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 (Standard Edition) and EE (Enterprise Edition) versions.
JJOS (jJOS/decaf)
Combines the jJOS kernel and decaf virtual machine. [Open Source]
JC Virtual Machine
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 built-in ELF object file loader. [Open source, LGPL]
Java/Kaffe for Amiga Computers
Information on getting Java (Kaffe) to run on Amiga computers.
IBM Developer Kit Porting
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]
GNU Classpath Extensions
A free replacement for the "javax.*" classes (core and otherwise); sibling project to GNU Classpath. [Open Source, GPL/LGPL]
GNU Classpath
A free replacement for Sun's proprietary core Java class libraries. [Open Source, GPL with exception]
GCJ
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]
ElectricalFire
A Java Virtual Machine (JVM) that supports Just In Time (JIT) compiling. [Open Source, MPL].
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