ZoneMinder - ZoneMinder is a free and open-source piece of security software that can be used at home or in your business. The software puts you in control of all of your data, and it is exceptionally easy to setup. Read more about ZoneMinder.
Webcamoid - Webcamoid is a full featured webcam capture application.
Blue Iris - Blue Iris is a high end security monitoring system that lets you view and control the feeds from all the cameras at your home or place of business.
Cheese - Cheese uses your webcam to take photos and videos, applies fancy special effects and lets you share...
MotionEye - motionEye is a web frontend for the motion daemon, written in Python.
Cameroid - Just like Photo Booth - exept is online. Have fun with your webcam. Apply text and funny effects.