Kext files in Mac OS X are vital, since they are extensions of the kernel that control the entire operating system and that make everything go right ... or wrong, depending on what we install or play.
Installing Kext by hand is really tedious, so the use of an application like this becomes almost totally indispensable when it comes to modifying these extensions to change aspects of Mac OS X.
With Kext Drop you just have to drag the kext to the window and wait, no more, no less. It's really easy to use, so we can't help but recommend it.
Source | OS X Daily
Link | Kext Drop