Golly is a simulator of Conway's Game of Life and numerous other 2-dimensional cellular automata (CAs). A transducer is a device that converts energy or signals from one form to another.
This rule set by NovaYoshi combines WireWorld with a few other well-known CAs, including one of the Banks CAs. Each other CA has a few extra states, called "transducers", designed to translate between signals in that CA and WireWorld sparks. There are also some spaceships that travel in the space between built-up areas and can patch or break wires.