SeisMac: Turn Your MacBook Into a Seismograph

“SeisMac is a Mac OS X application that turns your MacBook or MacBook Pro into a seismograph. It access your laptop’s Sudden Motion Sensor in order to display real-time, three-axis acceleration graphs. Version 2.0’s enhancements make SeisMac an even more valuable tool for classroom demonstrations of seismic concepts and techniques.” –Link.