NOTE: THIS GAME REQUIRES JAVA 7 OR GREATER
I made this game for my AP Computer Science class back in 2007, junior year of high school. There are a few bugs that I never had a chance to fix.
For Windows, just download and run the exe. For Linux, just download the jar and run it via the command "java -jar checkers.jar". This requires Java 7 or greater.
The Java .JAR package works on MacPro3,1 Running OS 10.9.5 / with Java 7 ... I didn't SEE any bugs or I'd file a Bug report.