Unity - The multiplatform game creation tools for everyone.
Cheese - Cheese uses your webcam to take photos and videos, applies fancy special effects and lets you share...
Godot Engine - Feature-packed 2D and 3D open source game engine.
Webcamoid - Webcamoid is a full featured webcam capture application.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Cameroid - Just like Photo Booth - exept is online. Have fun with your webcam. Apply text and funny effects.