This defuses light and creates a soft indirect light. It also softens shadows.
Beauty Dish
The Beauty Dish eliminates hot spots and harsh shadows. It makes the skin look more flattering by softening tones and the light intensity.
Diffuses light by softening the lighting on the image. Adds a soft glow it can soften shadows or eliminate them all together. It can be used for lighting backgrounds and/or subjects.
Snoot
The snoot lets out a single light of beam of light and prevents light spill.
This narrows the beam of light to a circle with soft edges. Also it softens the light and only weakly eliminates your subject.
Barn Doors
Photographer can control how much light can hit the subject, also you can control how long a shadow can be in the image or eliminate it completely.
Reflector
This creates a harsh light and harsh shadows. Reflectors are mainly used for lighting up backgrounds.