GetSmart is a download manager that supports Multi-Connection downloads. With Multi-Mirror search it can download different parts from these mirror servers simultaneously. It can 'act as proxy' to serve multiple clients. It can also works as a Daemon.
JuMPingSoCketS is a Java Multi Protocol Server Client System (JMPSCS). It is a plugin-oriented communication tool for serveral filetransfer- and chatprotocols for both client and server protocols.