Pokemon NXT is a fanmade free Pokemon game, the game allows you to travel around massive fields and take direct control of your Pokemon.While the game is in its extremely early stages it is already showing promise. Below are links to the game and its site so you can play it or get more information on how you can help with the game.
Play the game here.
Help the creators here.
Below is a video captured by YouTube user ScottyPlaysGames , remember this is Pre-Alpha, and is in no way an indication of the final build.