Here is a short list of web pages with links to digital facsimiles:
LSA: https://lutesocietyofamerica.wildapricot.org/Tab-Facsimiles
Dead (no updates since November 2015)
https://kakitoshilute.blogspot.de/
somewhat chaotic in English an Japanese
Last update a few days ago(?).
Nancy Carlin: http://www.groundsanddivisions.info/
http://www.dolcesfogato.com/Music/
pdf files created from those single page files provided by some libraries.
http://imslp.org/
https://repository.royalholloway.ac.uk/access/home.do
go to early music online - poor versions from films
Gerbode: http://gerbode.net/facsimiles/
Apparently all created from films
Jo Bringmann: http://www.jobringmann.de/facsimile-links
by far the best
You should/might also cheek form time to time:
https://www.bsb-muenchen.de/
Searching is difficult.
https://www.europeana.eu/portal/en
Searching is difficult. Try Lautenbuch, liuto, lute, tabulaturbuch, ....
What else?
Rainer
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