Austria (text in German and English)
Belgium (text in Dutch, French and English)
Canada (Quebec - text in French )
Canada (text in English)
Czechia (text also in French, German, Polish and English)
France (text in French)
Germany (text in German)
Great-Britain (text in English)
Hungary (text in Hungarian)
Italy (text in Italian)
Japan (text in Japanese)
Netherlands (text in Dutch and English)
Poland (text in Polish, German and English)
Spain (Andalusia - text in Spanish)
Spain (text in Spanish)
Spain (Catalonia - text in Catalan)
Switzerland (Basel - text in German)
U.S.A. (text in English)
Willy Leenders (website)
Willy Leenders (Wikipedia)
Willy Leenders (memoires)
Frans Maes (website)
Patric Oyen (website)
Calcad (Yvon Massé / French and English)
Orologi Solari (Gian Casalegno / Italian and English)
Shadows (François Blateyron / French, English and German)
Sonne (Helmut Sonderegger / German and English) New version 7.0
ZW2000 (Fer de Vries / Dutch and English)
N.B.: ZW2000 is still available but the software is no longer maintained since the death of Fer de Vries in 2015.