Unworkable is a BitTorrent implementation written in C using libevent. Goals include high code quality, efficiency, simplicity and security.
hotwired is a Hotline server for Unix-like operating systems. It aims to implement all the features of the level 2 Hotline protocol (i.e. Hotline > 1.5), including transfer queues, threaded news, and user management.
Bash scripts for transfering files (and directiories with sub-entries) over the network. Required "netcat OpenBSD"