OnX 1.7 for Mac can be downloaded from our website for free. This free Mac application is a product of Realmac Games. The program is included in Games.
From the developer:
OnX is a simple game of Tic-Tac-Toe with an interface look similar to Apple's OSX Aqua design.
You may want to check out more software for Mac, such as WinOnX, which might be similar to OnX.