jTCPfwd started as a simple Java command line tool to forward TCP ports. Lots of other features are added, for example for forwarding TCP connections over reverse TCP connections, UDP/HTTP tunnelling or writing files to a network share.
Hyper-M is a bluetooth based DHT peer-to-peer infrastructure for J2ME (CLDC1.1/ MIDP2.0) enabled handphones. Hyper-M allows the user to create a peer-to-peer network and share and retrieve files on this network. Has been tested mainly on Nokia handphones