Search here (above)...
Just click on the "Addons" link (3rd front the left at top of page)
In the drop down tab on the right select "Map" or "Map-Mod". You can refine your search by number of players, amount of OIL, author, etc...
There are over 200 maps to be downloaded.
Also try this link:
Copy/Paste the link into your browser address bar and it should bring up the download directly, there are lots of maps (598 to be more precise) compressed into a ZIP file called "wzmaps.zip"
Good luck, and enjoy WZ2100!
Do NOT post maps or links that do not have a CLEAR license, and Author. Those the rules we must follow.