This suite of plugins consists of many tools developed over many years of compositing when off-the-shelf effects in After Effects would not provide satisfactory results. Some of them solve small problems, like softening an edge of a matte, others evolved into full blown keying solutions.
combine alpha mattes of different layers with one simple effect,
clean an alpha from small speckles left after keying noisy footage or difference matte,
feather a matte edge “outwards” – you don’t lose thin details,
remove a dark edge after keying – this happens when the camera had sharpening turned on,
tell the despiller which pixels he should despill and which to leave alone,
difficult spill case? Just select the pixels with spill on them and use any of the normal AE effects to remove it,
select pixels based on their color, luminosity or even transparency.
Color Select HSL
Edge Blur Keyer