Clean room JVM, designed for embedded systems and workstations. [Commercial]
The 'Hungry Programmers' JVM supports Mozilla's Open Java Initiative. [Open Source, LGPL]
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.
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]
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]
An embeddable, clean room Java Virtual Machine. [Commercial, one time source license fee]
Provider of embedded and realtime JVMs. Provides news and evaluation kit download.