http://www.donelleschi.com/Donelleschi_Software/Face/Face2.php?pag=25_
this is a little utility for the Mac called Sapiens. I could tell you all about it but the website (requires a Flash emulator like Ruffle, it hasn't been updated in a while) should be able to do all the talking.
but, if you insist: it was a launcher that you could invoke by moving your mouse around in a circle. it displayed the apps that you most commonly opened from it in a radial pattern, and if you were dragging a file while opening it, it would just display the ones that supported that filetype.
unfortunately it seems like it'll fade into obscurity. it eventually hopped over to the Mac App Store but has been delisted since then. nobody's ever attempted to recreate it for any other platform, but the shareware version from ages ago has ironically stood the test of time (at least for now). if you're running an older machine then go and have a look
