elibsrv
a light OPDS/HTML server indexing EPUB and PDF files
...It allows to generate an OPDS repository of EPUB and/or PDF files scanned from on-disk directories. It also provides a simple html interface for non-OPDS humans, which makes it a good fit for both OPDS-aware devices (like Android with FBReader or Aldiko) and browsers with EPUB/PDF capabilities (for ex. Firefox with the excellent EPUBReader plugin).
It's worth noting that elibsrv is a complete solution - ie. it doesn't rely on third party software (most similar solutions are designed to work with Calibre...). ...