Weird New World is a big hex crawl that might work.

I ran a home-brewed megadungeon campaign about 10 years ago. I want to say it lasted for a few years. I never mapped past the first level, but the first level was *sprawling.*

I'm working on a new megadungeon now and I hope this will be my most successful campaign yet!

There are traps, puzzles, and even potential social encounters with the dragon and trolls.

What I like about it:

1) It is Jaquaysed. Multiple entrances, multiple choices about where to go.

2) Lots of "classic" monsters. I think a lot of D&D players only know about some of the classics but haven't actually encountered them.

3) It isn't just monsters…

I love that LotFP encourages creating new monsters the players have never encountered before. The essay in the Random Esoteric Creature Generator is gold… and it's really labor-intensive to come up with new monsters and use them only once.

I do really like the generators in the RECG and Carcosa!

Wow. I've never heard of these. They look amazing! And… they are pricy nowadays. They sound like amazing inspiration for roleplaying adventures.