MemoryGame is a project mainly written in ..., it's free.
OS X memory game written in applescript studio (Xcode)
This is a fun OS X game where you are given 20 hidden image tiles that you turn over to make 10 matched pairs.
You can reveal all images at once for 5 seconds, or under Preferences, you can set it to reveal one image at a time and specify a delay for each revealed image. This is useful for people who want to practice developing photographic memory skills.