This was so much fun to build! It really nicely showcases potential open source font options for e-readers.
https://ebook-fonts.nicoverbruggen.be
I plan on expanding the mini-site so people can just download the fonts via here, and include more information about the fonts, licensing etc. here as well.
I also have two new fonts lined up that aren't part of the v3.x branch yet that are really awesome and the product of MANY hours of tinkering.
@nicoverbruggen These are incredible. What is your personal favourite font for reading?
What margins and line spacing works best with these in Koreader?
@Margos Currently, Newsreader (and Readerly) are my new favorites.
I'm not sure about the best settings for KOReader. Experiment away, I'd say!
(I suspect you will need to bump line height to 120% or higher for the best possible results, because the line spacing is relatively tight -- which was done for improved Kobo compatibility.)
Nico Verbruggen
Margos