Our website provides a free download of SubRosaSoft HomeGuardian 2.0 for Mac. The actual developer of this software for Mac is SubRosaSoft.
From the developer:
SubRosaSoft HomeGuardia is a tool to help guard your home. Integrating movement detection, sound detection, and very flexible reporting, it turns your computer into a high technology security system.
Keeping the focus on guarding - HomeGuardian watches for trouble by looking for movement - and listening for noises - then reporting using the method of your choice.
What's new in this version:
Upgrade for Panther (OSX 10.3) compatibility
You may want to check out more Mac applications, such as USBVision, which might be related to SubRosaSoft HomeGuardian.