Books for Inform Designers — Inform7 is one of the most fascinating programming languages that I’ve ever come across. This page lists a few references for learning how to design games using the language and to think in the “Inform way.” Of course, I also recommend the great book Creating Interactive Fiction with Inform7.
Squib — “A Ruby DSL for prototyping card games.” I haven’t been able to make it run, but I love the idea anyway.
Game of Interest
Nomic — Nomic is a game of ever-evolving rules. The game in its purest form consists of a single rule — Players must all agree on the rules of the game.