You'll find hundreds of OPDS catalogs on the Web, but here are a few noteworthy catalogs to play with or understand how OPDS works.
If you're using Android, you can directly click on a catalog's link to add the catalog to Aldiko or FBReader.
Institutions
- Revues.org (http://bookserver.revues.org/)
Libraries
- Internet Archive (http://bookserver.archive.org/catalog/)
- Ebooks Libres et Gratuits (http://www.ebooksgratuits.com/opds/index.php)
Publishers
- O'Reilly (http://opds.oreilly.com/opds/)
- The Pragmatic Programmers (http://pragprog.com/catalog.opds)
Retailers
- Feedbooks (http://www.feedbooks.com/catalog.atom)