TiltShift is once again available on the Mac App Store. It is an app for computer generated tilt-shift photography. It allows you to create fake miniature versions of regular photos, simulating the effect of expensive tilt-shift lenses.
You can define an arbitrary position for the virtual focal plane and setup its properties using an intuitive visual interface. Additional controls for saturation, contrast, brightness, sharpness and vignette let you create amazing fake miniatures.