Red Dwarf (GitHub: rviscomi / red-dwarf, License: MIT) by Rick Viscomi is a heat map visualisation of GitHub repository stars. It can display stars for a specific repository, so the joyent/node heat map is pretty interesting given the sheer amount of stars it has.
Florian's documentation is detailed, and the "door" example is an easy one to follow if you're confused about how the project can be used. Some simple tests have also been included, with a small HTML test harness.
I still hang out in IRC, and I still like using Mutt for email. There's something reassuring about the glare of colourful text-based interfaces that no GUI will ever replace. If you're a fellow console hacker, then you may find a use for ansiup (License: _MIT, npm: ansi_up) by Dru Nelson. It converts text with ANSI terminal colour commands into HTML, so you can take your FIGlet-powered nonsense to the web and annoy people with it there.
Dru says this project has been used "in production" since early 2012 -- I wonder what it's being used for?