A Zcode interpreter written in Python. Plays Inform games (up to v7). Give it an Infocom game and it'll run it. I suspect that it can be included in or called from other code.
Somebody ported the original ADVENT to Python 3. This implies that it can be built into or called from stuff.
Website for a new sci-fi adventure game for the C64 and ZX Spectrum. Free. Downloadable.
The text adventure version of the movie _The Dark Crystal_ is now playable online.
The People's Republic of Interactive Fiction is a club-slash-group in Boston for and by afficionados of interactive fiction - text adventures, in other words. If you fondly remember playing Zork, Suspended, Wishbringer, or any other text adventure way back when, and you're near Boston, this group might be for you.