"Fretless Zithers" at MinerMusic.com (頁面存檔備份,存於互聯網檔案館) English language site dedicated to the chord zither. The authors present arguments for the instrument to be renamed 'fretless zither'. Contains some dead links.
"Zither US" (頁面存檔備份,存於互聯網檔案館) English language site based in the U.S.A.. Contains biographies of early performers and personalities associated with the history of concert and Alpine zithers, mainly in the U.S. Also contacts for resources like instrument maintenance, enthusiast clubs and events.
'Zithernhistorie' German language site describing transition from drone zither to 19th century Mittenwald and Salzburg concert zither
Zitherseite von Werner Wölfing. German language site with photographs, history and different types of zither, links to further information and resources, zither makers and players