Hope you like them. The first batch will require no mods, but I'll upload some more interesting ones based on real areas in the UK later on.
Name: Multiplayer Islands. A part-generated, part-hand crafted map.
Objective: To have a company value of £50,000,000 and be the top performing company
The idea of this map is to play with another human. There are 2 major "islands" (it's actually a big square with a river running down the middle, but who's counting?). Flip a coin to determine who gets to choose their island. After a pre-agreed number of years (I usually use 5-7 years)...it's time to invade each others' islands.

...or just play it as a relaxing single-player game with no competitors.
No Mods Required.