intfiction.org

While not specifically metred, Ad Verbum follows in the wordplay footsteps of Infocom's odd man out Nord and Bert.

I attempted using AdventureCow to write a lipgrammatic CYOA, but was stymied by its inability to direct to a new section without use of the word "page" 8) That one may still come out the other end of the pipe someday, perhaps using Twine.

The language of Nevermore was quite poetic, though it's been a while since I've played it, so I can't remember if it was iambic or not.
http://ifdb.tads.org/viewgame?id=0gp3my5d5wi0owtu

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Ever stop to think and forget to start again?

Nevermore isn't iambic (nor does it appear to have any other kind of metre) but the passages from The Raven which it quotes are in trochaic octameter.