How can I get more ebook OPDS download sites for the reader?
Here is a list in MobileRead Wiki: http://wiki.mobileread.com/wiki/OPDS#Online_OPDS_Catalogs, you can also google “opds sites” for more.
According to the developer’s blog, this reading app Moon+ Reader, has been removed from Google Play because of a piracy complaint.
Moon+ Reader supports OPDS. This is an RSS-like protocol that enables websites to offer ebook downloads inside compatible reading apps. While at first glance it looks like a download protocol, it would be better to describe it as a catalog protocol because it also includes important metadata like title, author, file format type, and description.
Far from being a tool of pirates, OPDS is used by many legitimate ebookstores and download sites. Project Gutenberg, Baen Books, Internet Archive, and Feedbooks all use OPDS to offer ebook downloads, and the app developer Bluefire uses it to connect their reading apps for iOS and Android with partner ebookstores. There’s even a trick where you can set up your own library of legally purchased ebooks in your Dropbox account and create an OPDS catalog for it.
You can download the free version of the app from the developer’s website. The paid version of the app requires a $5 registration fee which can be paid via Paypal.