The multiple listings, as Kevin said, are for the multiple formats. If you click on the "ebooks" link at the top of the home page (right between UserCP and New Posts) you'll have an option to browse all new ebooks, or your choice of formats.
The browsing page has options to filter by format and by category. For example, I'm currently looking at a list of all the science fiction in epub format. You can sort that list by author or by date uploaded.
The descriptions, reader comments, etc., are in the individual book listings, like this one:
https://www.mobileread.com/forums/showthread.php?t=36707
The reason there's no price shown is that there isn't one.
That's right, they're all free. They've either been shared by their authors as promos, such as the example above, or they're out of copyright and have entered the public domain.
Happy reading!