Or see the list of project sponsors.
This is a tiny library by Fernando Borretti. It implements analogue of the UNIX utility
POFTHEDAY> (which:which "which") #P"/usr/bin/which" POFTHEDAY> (which:which "sbcl") #P"/Users/art/.bin/sbcl" POFTHEDAY> (which:which "python3") #P"/usr/bin/python3" POFTHEDAY> (which:which "missing-binary") NIL
That is it. No more, no less. What do you think, when this library can be useful?
By the way, there are many other trivial (but useful) libraries. All of them are marked with a trivial tag on #pofthedday site.