If the city you want isn’t listed and you’ve tried searching the web, don’t give up. Try a search using Italian key words for bus map, timetable, etc. See this short list of Italian key words and glossary to help you understand Italian timetables.
Chianti Valdarno bus map and timetables
Firenze (Florence) map of bus services
Lucca city and regional bus maps
Parma bus map and current timetables
Venice vaporetto (water-bus) map