JPLensFlare is a wonderful lensflare manager.
A lens flare is a visual effects that appears when you look at a source of light, a beautiful effect that cross the screen, starting from the light position to the opposite of the screen/field of view.
Lens flares are so beautiful that they can make a game that has poor graphics look amazing. You can take a look to a sample game using JPLensFlare by clicking the link below.
Take a look a the image below (taken from JPLensFlareSample):