Implementations Research Systems
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Open Runtime Platform - Research framework implementing advanced JIT and GC interfaces. These interfaces allow the JIT, GC and remaining runtime system to be developed in complete isolation and at independent rates. [Open Source, Intel License]
Sable Research Group - Publications - Papers and theses on optimization and efficiency of Java virtual machines.
SableVM - Java virtual machine for GNU/Linux. [Open Source, GPL]
The Squawk Project - Research Java VM, examines better ways to build VMs. Most commercial VMs are coded in low level languages: C, assembly. Goal: write as much of VM as possible in Java, for portability, debugging, maintainability. Inspired by Squeak project. Help build the largest human-edited directory on the web.