I am the upstream developer for inform6-library. The URL should be https://github.com/DavidGriffith/inform6lib.
Also, the Inform6 compiler and library can produce bytecode for the Glulx virtual machine as well as the Z-machine.
-- David Griffith dave@661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?