Kaffe is a clean room design of the Java virtual machine. It comes with a subset of the Java 2 Platform, Standard Edition Java API and Tools needed to provide a Java platform runtime environment.

Kaffe is a lean, fast and portable virtual machine. When compared to the reference implementation of the JVM written by Sun Microsystems, Kaffe is significantly smaller. Thus, it appeals to embedded system programmer. It comes with just-in-time compilers for many of the CPU architectures it has been ported to, more than 70 system platforms in total. It runs on devices ranging from embedded system SuperH devices to zSeries mainframes. It even runs on PlayStation 2.

Kaffe is free software, licensed under the terms of the GNU General Public License (GPL). It is being developed by a world-wide team of programmers. Beside the mailing list, the developers can often be reached via Internet Relay Chat in the #kaffe channel on irc.freenode.org.

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