Browser-based versions of cubeLife
These historical versions need Java to run on the web, which is not supported in newer browsers - if they work for you, great! If not, I apologise!
There's a version simply showing magic cubes with various colour schemes by Greg Turner, using Processing.js, which will be available here at some point.
If you want the real thing (and have a heartbeat detector) I'm considering making the source code for the main Java app (not these) available on GitHub.