A team at the Institute of Egyptian Art and Archaeology at the University of Memphis have put together an online bibliography of all open-access Egyptology books available for download online.
The list includes a wide range of publications, from public domain (books whose copyright has expired) through to those published as open access within the past few years.
It’s basically a list of books, ordered alphabetically by author, with links to their online home. This might make it a bit tricky to use if you’re researching by subject, but if you know what you’re looking for, or just want a bit of a browse, I think it’s going to be a really useful resource.
You can find the page here: http://www.memphis.edu/egypt/resources/onlinebiblio.php