Basketball GM is a single-player basketball management simulation game. Set your roster, make trades, draft prospects, manage your finances, and try to build a dynasty. Play it in your browser now, completely 100% free!
One of the fun things about Basketball GM is that you can view the entire source code to the game, which opens up a level of modding and customization that is matched by few other games. Furthermore, you can even get your improvements included in the game itself. As you can see, that has resulted in a nice trickle of improvements from the community, including a recent PR from icedjuro which added the annual ratings change to player pages: