Features
First, what CAN'T you do with it? You must have: 2-8 players, two six-sided die, two card decks, and a square board with 40 tiles. That's it! Everything else about the board is customizable!

Create your own board/game themes including names, graphics, number of buildings, cost of buildings, etc.
Make any tile a prison, or anything else!
Flexible architecture adapts to your customizations
Create your own computer players using Python
Play over a TCP network with friends

Source Code
The software is released under the GPL. You can do anything with the code that is acceptable under the GPL.
This includes:

Freely distribute the game (source should be included).
Make any modifications to the program you like (staying within the GPL).

Mynopoly is a trademark of Mark Ericksen.