Blinkenlights: Blib, Blinkentools, and Blinkensim. All three tools are available here.
Blib: blib is a library full of useful things to hack the Blinkenlights. If you need to read the various formats for Blinkenlights movies, want to implement the network protocol, or aim to develop a viewer/editor or simulator for the Blinkenlights, this is what you need.
Blinkentools: blinkentools is a set of commandline utilities related to Blinkenlights. It includes b2b, a converter for blinkenmovies that can apply some simple effects, b2mng, which creates MNG animations from blinkenmovies, and bsend, which sends movies over the net using the Blinkenlights network protocol.
Blinkensim: blinkensim is a graphical Blinkenlights simulator that displays the UDP packets it receives according to the Blinkenlights network protocol. It supports themes and comes with DirectFB and GTK+ backends.