The Tama Cobra Clutch is foot operated as opposed to the other drop clutches that are activated by hitting the lever with a stick, that way the foot operation doesn't get in the way of drumming, and with the Cobra Clutch you can choose how open it will leave the hats open when it drops.
It's compatible with other brands apart from Tama, I think it works with DW hi-hat stands but you have to do some research.