Java support in some browsers has been discontinued. To run Mocha without a browser, make sure you have a recent version of Java installed. Download the executable jar file and double-click to start (or run the following command): java -jar mocha.jar

This version supports local cassette, bin, and disk images as well as snapshots.

Miscellaneous

Original Mocha Web Page - If your browser still supports applets.
Standalone Jar File - Download and double-click to execute. Java required.
What's New? - List of changes over the years.
E-Mail - Let me know what you think. Bug reports and suggestions welcome.

The Future

Android Version - This actually exists although it remains unfinished.
JavaScript Version - ALMOST DONE! Look here.