Video Output as iSight Input

I'd like to be able to display videos and pictures through my MacBook Pro's webcam on Skype and other online chat sites. I previously used programs such as ManyCam to emulate a webcam, however, many online sites no longer accept external video inputs - only iSight (built-in or external).

Is there any way to be able to send the output from ManyCam to the input of iSight? This way, I can still display videos on sites which only allow iSight, as the video will technically be coming from an iSight cam.

Camtwist works for such things (haven't yet personally tested it in mavericks)