It's called Bookswim, available at http://www.bookswim.com/ http://www.bookswim.com/ , and I have no idea whether it's good, because I cannot conceive of using

It's called Bookswim, available at http://www.bookswim.com/ http://www.bookswim.com/ , and I have no idea whether it's good, because I cannot conceive of using them over the library.