Are there any good 'Map Packs' or other non-TC mods? I've been looking and pretty much every mod I find is some kind of TC or otherwise changes a whole lot of stuff. I'm just looking for good map compilations in the vein of the original game. Are there any?

maps can be found at MSDN

packs at the bottom of the hot maps page:

http://msdn.duke4.net/index.shtml

more maps at DNR

http://dukerepository.com/

Awesome. Any that you'd recommend?

pretty much the way the rating scale is setup 80 to 90 are very good and 90+ maps are excellent.

The Roch series (Pascal Rouaud) and the Red series (Merlijn van Oostrum) are good starting points, maps by Luciano Gallo (Gambini) and Alejandro Glavic are nice solid levels

I have my favorites, but there are so many maps that are fun and worth a look that listing them all isn't realistic.

I would suggest anything rated 83 and up

Thanks for the advice, but I realized that this isn't actually what I was looking for. I was looking for maps like this put together into episodes, so I can just select a collection and play them. Really I should have just said 'Non-TC Mods' in the first place.
Thank you for the help, though! Sorry for any confusion.

okay, i understand. episodes

not all these are going to be of the highest quality, but here are some suggestions:

duke is ten
lost duke
MSSP
Red Episode
StevePak
WGSpace
Last Reaction & Water Bases

if you have the time, go through these directories

http://dukeworld.duke4.net/2001-current/tc/
http://dukeworld.duke4.net/classic%20dukeworld/tc/

or go to this site and read the descriptions, so you can avoid downloading items that are a hassle to install and remove

http://webspace.webring.com/people/ue/eddym4814/

Super awesome! Thanks!

A Load of Maps can be found at:
http://duke3donline.com/Database/Maps/index.php
Enjoy those maps for Duke 3D