These are Quicktime countdown timers. They can be used in any program that supports Quicktime including Keynote. They are saved using the Animation codec, so they include an alpha channel making the background transparent. (NOTE: Keynote does not allow you to use these timers across multiple slides, only on a single slide. This is a limitation of Keynote, not the timer).

QT countdowns will be back up for sale in a few days.