A Multiplatform GUI for Mldonkey( Open source, multi-platform, multi-protocol P2P client. Includes support for eDonkey2000, Overnet, BitTorrent, Direct Connect and Fasttrack, ... ) written on JRuby + Swing
ngetsuite is a collection of ruby scripts for retrieving binaries from Usenet. It uses nget and yydecode for fetching and decoding, stores the article headers in a MySQL database, and comes with a eruby web interface for remote control.