let's play: Inform 10's Basic Inform and Standard Rules (Complete) - Authoring / Inform 7 - The Interactive Fiction Community Forum
interesting tour of Inform's innards, for reference and reading later
Another RPG Engine by Another RPG Enthusiast
"An engine for creating role-playing games using Twine's SugarCube language. Features a complex battle system that can be modified and integrated into your Twine stories."