There's a PC product (software) called Calibre - it's free. It allows to shelve epub/PDF/etc ebooks like a library, but it also has an inbuilt Epub reader (which a lot of the ebooks are in these days). Books can be displayed by Author, category, language, date, and so on, and opened directly from the product (bit like Windows Media Player with respect to Albums/Tracks/artists etc). It links with many book retailer sites to snatch the Metadata too so you don't have to feed all that info in - you can even use your own cover images or pick an image from the book, instead of using the real book cover. I use it all the time for manuals and things - even recipes - that I have downloaded.