My Pax map collection can be downloaded here (1,335 maps). This collection includes Egg's map collection (available on diogames.com/forums), as well as many of my own personal maps, and other maps that I've downloaded from various sources.
There is also a smaller subset of maps from the above collection, which I use on my server as maps that can be randomly selected when someone votes for a random map. You can download that here (569 maps). I have tried my best to include the author tag for every map. Unfortunately, in many cases this information is unavailable.