One old Mac shareware I miss because I really loved it was Concentroids from Planet X... It was a memory game released in 1993 for System 7 (AB, on Macs, it's System [number] till 7, then OS [number], starting with 8 )
I used to play it till I got my first iMac. Then the computer was too fast and the animations were dizzying!
You can find it here: http://www.grenier-du-mac.net/fiches/concentroids.htm
The download link is the word "Télécharger" at the bottom of the screen.