Version 1.5 released! SeisMaCalibrate is a Mac OS X Cocoa application that calibrates your Macintosh laptop's Sudden Motion Sensor. Once calibrated, my seismology tool SeisMac will be much more accurate. SeisMaCalibrate is based on SMSLib, my open-source Sudden Motion Sensor access library. SeisMaCalibrate is freeware. You can download version 1.5 here (Mac OS X 10.4 or later).