Here are some online tools and toys related to interactive fiction and game development.
Transcript Beautifier
The Transcript Beautifier turns dull text transcripts into hyperlinked, syntax colored, easy to read HTML files. Optionally it can also collect a list of unimplemented commands and comments given by playtesters.
IF Name Generator
If you take the first part from an IF title and the last part from another, what do you get? Nonsense, but entertaining nonsense. Includes special IFcomp editions.
I7 Thing Creator
A tool for easily creating objects and responses to standard actions in Inform 7 by filling out an online form. It hasn’t been maintained for a while so the code it produces is not 100% compatible with the current versions of Inform.
Inform 7 extensions
All extensions published by me can be found at the official Inform 7 web site.

Sorry to see I7 Thing Creator marked as DEPRECATED.
It really is rather handy for quickly getting the framework of and IF adventure up and running.
So far, it seems to work reasonably well with the current version of Inform7 on a Mac, but I do get some “black” fields when I integrate it into the IDE and use the supplied .css file.
Is this easy to fix? Can someone suggest how?