Could you advise an Open Source method (platform, software) for creating an online library? I want to create a rather simple online library that will provide an opportunity to download the file of book (pdf, djvu, doc, docx), not necessarily for reading the book on the Internet, but rather for downloading the file. I would also like to provide some simple opportunities to search for books (by title, author, theme). All books will be located in thematic sections, possibly just as lists with the books in alphabetical order.
I'll be doing this for the professional community, and the general topic of the library will be dedicated to the Nature Conservation work (all different aspects). Also, we will place these books in view of copyright protection (with the permission of the authors, and with books that have open access as well as older publications).
I am not a specialist in web-creating and programming, that's why I'm trying to find something rather simple, but acceptable to do this.