I like good books.
In the past I've produced some E-Books of old books in the public domain. I will link them here and maybe review them if I've actually read them (which I haven't done with all of them).
For producing the pdfs I've used LaTeX for some and groff for others. Especially groff resulted in some formatting errors, but I've lost the source for I think all or at least most of them, so I can't correct that. They should be very readable though.