Here is a pretty simple program to help you practice and test your board knowledge in your head.
There is a link on the page to download the program or just start the Java version.
Also at ChessVideos.tv they have a Chess Visualization training page as well with three training methods. Knight moves speed quiz, Color square speed quiz and a Find the best move method.
Chess Visualization Training
Komodo 10.4 Is Out
3 days ago