ONLINE LISTS OF LUTE TABLATURE PUBLISHERS
The Lute Society maintains a list, intended to be comprehensive, of publishers of lute tablature, at: www.lutesociety.org/pages/publishers
LISTS OF MUSIC IN PRINT
Kenneth Sparr's website has an invaluable list of lute music in print: www.tabulatura.com/TABULATU.htm
See also within this portal the other pages in the 'Historic Repertoire' category.