You mean Inform? It's definitely one of the best ones, and freeware as well.
Also, it is the most faithful to the old Infocom games. As far as the best,
Inform and TADS are my favorites, with Inform coming out slightly on top...
that's really just a matter of personal tastes, though. There is a FAQ on
adventure game authoring systems over at ftp.gmd.de that has the pros and
cons of almost all the various IF compilers.
--| Mike | .sig compressed to save endangered ASCII characters! |mikef@cybernetics.net | <Snow Crash quote, chapter 36, p.271> <C&S reference> | If I had a web page, | <10-page ASCII rendition of Marshall McLuhan golfing> | I'd mention it here. | <fannish Pixies/Fugazi references> <dumb disclaimers>