GNU Classpath, Essential Libraries for Java, is a GNU project to create free core class libraries for use with virtual machines and compilers for the Java programming language. Classpath is still a work in progress. The first public release will be version 1.0. There have been no public releases; however, pre-release source code is available via GNU's anonymous CVS server, and snapshots of the Classpath tree have been released and are available from ftp://ftp.gnu.org/gnu/classpath/
WWW: https://www.gnu.org/software/classpath/