Move Action

Move Action is a freeware Windows tool designed to turn your webcam into a powerful surveillance system, offering a bunch of useful tools with minimum configuration options.
It's pretty difficult to get lost in the main window after you launch the program for the first time, not necessarily because it's well organized, but also because of the limited number of features.
The ace up its sleeve is the motion detection tool, which is actually the one that serves as the foundation of each feature bundled into the app.
What Move Action actually does is to monitor the webcam and, in case motion is detected, to automatically perform a certain action.
For example, the program can lock the computer, which means the user in front of the monitor needs a password to get back into Windows, save JPG images to the local disk, play a WAV sound file or simply launch an external application.
In case you're wondering how is this possible, Move Action relies on quite a basic engine: it analyzes images at a regular interval and in case it notices some differences between them, it means that it should perform the user-defined action.
Move Action runs on low resources most of the time and works flawlessly on all Windows versions, without the need for administrator privileges on Windows 7 workstations.
So, as a conclusion, Move Action is quite a basic product that serves its purpose very well, but nothing more. If you're searching for a minimal interface, a limited number of configuration options and simple features, you're in luck.