The N01 Program allows you to "chalk" virtually on your PC at home.
n01 was built to play '01 games with steel tip darts. You input the score that you got in the game and n01 shows the winning average and also your dart average. n01 is the scoring software for real 501 games on the dart board, but not for video games. Scoring for '01 games (301, 501, and 1001), or play against the computer on six different levels. Freeware.