I've designed my own game engine (written in PHP) for
creating http-based adventure games similar to AGL, but I
have yet to design any complete games in it. I've been
planning to start a project for some time, but nothing's
happened yet. Someday, perhaps. Creating a full text-
based adventure takes a very long time and I'm just too
busy to undertake that right now. But if any game
developers here read this post and are interested, I can give
them some information on the engine and see if they still
want to give it a shot. That way, maybe before too long,
there will be more games like what you're looking for
available online. 'Cause I can't find any, either. :-)

-useless"so, any programmers out there?"ness