Sean Barrett's "Inform Varying Strings", an Inform 6.21 compiler modification that "provides a mechanism by which printed strings can be made to vary with no programming effort on the part of the author. Each string that prints is chosen from several options; the choice can be at random, with constrained randomness, in sequential order repeating the last, or in sequential order wrapping around to the beginning." This was used in Barrett's game "The Weapon".
A patch for Inform 6.30 to add an assertion mechanism, by Simon Baldwin.
Jesse McGrew's "Typed Inform", an extension of Inform 6.31 with the goal of introducing a general way to manipulate values larger than a single virtual machine word.