n01 was built to play 501 games with steel tip darts. You may input the score that you got in the games. n01 shows winning average and also your dart average.
n01 is the scoring software for real 501 games on the dart board, but not video game.
A screenshot of n01
n01 Ver 0.2.6 (2016/08/11)
Work with Windows 95 and later.
To install n01, Execute the downloaded file on your PC and also extract to suitable folder.