Entangled is a distributed hash table (DHT) and peer-to-peer tuple space, based on Kademlia. It is written in Python, and makes use of the Twisted framework. This can be used as a base for creating peer-to-peer (P2P) network applications.
Concurrence is a networked file editing program that enables multiple people to modify a document simultaneously. It is written entirely in Python, and uses the wxPython library for the GUI and the Twisted library for networking.
tprsh (Twisted Perl Remote Shell) is a set of client/server Perl scripts which allow the server to execute commands on the client via TCP. The scripts use the IO::Socket module and run on Linux and Windows.