There are many, but I don't know of any that have only Irish tunes (in so many cases, it's impossible to be sure whether a tune is originally Irish, Scottish or English).  The most comprehensive resource is certainly J C's Tunefinder, as Sorcha says, though in principle you search there for a given tune-name.  Look at  CEOLAS  for lots of very useful links; it's where I started out looking for fiddle tunes a couple of years ago when I was new to search-engines and the like.

Malcolm