There are a stack of great free ebook repositories available on the web, 
things like https://unglue.it/ http://www.gutenberg.org/ 
https://en.wikibooks.org/wiki/Main_Page http://www.gutenberg.net.au/ 
https://www.smashwords.com/books/category/1/newest/0/free/any etc, etc

What there doesn't appear to be, is high-quality AACR2 / RDA records 
available for these. There are things like 
https://ebooks.adelaide.edu.au/meta/pg/ which are elaborate dublin core 
to MARC converters, but these lack standardisation of names, authority 
control (people, entities, places, etc), interlinking, etc.

It seems to me that quality metadata would greatly increase the value / 
findability / use of these projects and thus their visibility and 
available sources.

Are there any projects working in this space already? Are there suitable 
tools available?

cheers
stuart