RedHand

If you're concerned about the security of your Mac when it's unattended, RedHand is the perfect software for you. By allowing you to lock your desktop while keeping your session active, there's no need to log out. In addition, RedHand will keep track of all desktop lock attempts and invalid password entries, which is a valuable feature. The best part is that it will also take a photo using your iSight camera or other connected video device, which is included with the record of the events.

RedHand is convenient to use as well. You have the option to activate it through a hot key, Dock icon, or even its menu status item. And it's housed in a PreferencePane, which lets you easily install it on either a local or system-wide effort just with a double-click.

Overall, RedHand is an excellent software for those who want peace of mind when it comes to their Mac's security. Its features are easy to use and efficient, and it's definitely worth considering if you're thinking about adding an extra layer of protection to your computer.