It's a port of Travis Griggs' package from VisualWorks -- a fairly direct mapping of Cairo objects into Smalltalk. I posted it on SqueakSource just a couple of days ago:

I have been using it for our VisualWorks web apps for quite a while and wanted to bring it with me. Plus I really need portability between Pharo and GLASS. Not that I couldn't do that with Rome, but this seemed like an easier path for me.