GNU Classpath (essential libraries for Java) is a project to create free core class libraries for use with virtual machines and compilers for the Java programming language. It includes all native methods and core classes necessary for a completely functional execution environment.
The Hunting of the Snark Project contains a client for downloading and sharing files distributed with the BitTorrent protocol. It is mainly used for exploring the BitTorrent protocol and experimenting with the GNU Compiler for Java (gcj), but it can also be used as a regular BitTorrent client. Snark can also act as a torrent creator, a tiny HTTP server for delivering metainfo.torrent files, and has an integrated tracker for making the sharing of files as easy as possible. When you use the --share option, Snark will automatically create a .torrent file and start a very simple Web server to distribute the metainfo.torrent file and a local tracker that other BitTorrent clients can connect to.