llvm
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Latest: Strongtalk has gone fully Open Source! The virtual-machine source code is now available, as of September, 2006. Previously, the VM was available only as an unsupported binary, preventing serious use of Strongtalk.
Strongtalk: A High-Performance Open Source Smalltalk With An Optional Type System
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies. Despite its name, LLVM has little to do with traditional virtual machines, though it does provide helpful libraries that can be used to build them . LLVM began as a research project at the University of Illinois , with the goal of providing a modern, SSA-based compilation strategy capable of supporting both static and dynamic compilation of arbitrary programming languages. Since then, LLVM has grown to be an umbrella project consisting of a number of different subprojects, many of which are being used in production by a wide variety of commercial and open source projects as well as being widely used in academic research . Code in the LLVM project is licensed under the "UIUC" BSD-Style license .
The LLVM Compiler Infrastructure Project
GCJ- The GNU Compiler for Java- Home Page - GNU Project - Free Software Foundation (FSF)
GCJ is a portable, optimizing, ahead-of-time compiler for the Java Programming Language. It can compile Java source code to Java bytecode (class files) or directly to native machine code, and Java bytecode to native machine code. Compiled applications are linked with the GCJ runtime, libgcj , which provides the core class libraries, a garbage collector, and a bytecode interpreter. libgcj can dynamically load and interpret class files, resulting in mixed compiled/interpreted applications. It has been merged with GNU Classpath and supports most of the 1.4 libraries plus some 1.5 additions.