BeeCells3D

BeeCells3D is a highly enjoyable game.
Once you start, you won’t want to stop. Try it, and see how high you can score. The goal is to group six or more balls of the same color together. Once the balls are grouped, your score increases, and the grouped balls disappear to make room for more maneuvers. After each turn, the computer puts more balls on the board and your task becomes more difficult. The game is over when the board completely fills up.

System requirements: 700MHz or faster PowerPC or Intel CPU, MacOSX 10.4 or later
(it will run on 10.3 if you install OpenAL from here).

ColorRise

A group of three balls falls from the top of a tower. Using the keyboard you can control position and orientation of these balls. The goal is to group five or more balls of the same color together. Once the balls are grouped, your score increases, and the grouped balls disappear to make room.

System requirements: 1GHz or faster PowerPC or Intel CPU, MacOSX 10.4 or later 
(it will run on 10.3 if you install OpenAL from here).