Peter Orme

"A method of using assertions stored in a table to verify your game works as expected."

"Common definitions useful for Inform7 authors and extension developers."

"A logging tool for I7 that lets you log to transcript and (with Glulx) to file"

Object Descriptors adds the ability to list properties of objects, a bit like the "showme" command does, but this makes it available from other code (for example, for inclusion in debug logs).

"A developer extension that lets you write unit tests (asserts) in Inform 7."

This extension provides you with testing commands for force opening things. The commands are all in sections marked as "not for release" - this is intended to be a tool during development and test, not for actual games.