Cheese - Cheese uses your webcam to take photos and videos, applies fancy special effects and lets you share...
Webcamoid - Webcamoid is a full featured webcam capture application.
Kamoso - Kamoso is a webcam recorder from KDE community.
Deco UI Kit - Everything you need to make a social, news or shop app.
WT:Social - A news focused social network from the founder of Wikipedia
Cameroid - Just like Photo Booth - exept is online. Have fun with your webcam. Apply text and funny effects.