Bonelli Bus
The Italian-language website of an intercity coach operator.
http://www.bonellibus.com/

COTRAL
Check the company's bus timetables.
http://www.cotralspa.it:8115/standard/index_en.htm

COTRAL
Cotral is the main operator of buses in Rome and the surrounding region. Alas, the website is largely in Italian.
http://www.cotralspa.it/

Eurolines
European coach network.
http://www.eurolines.com/

Italbus
Coach hire specialist.
http://www.italbus.com/

Italy Heaven
Information and timetables for intercity bus services from Rome.
http://www.italyheaven.co.uk/laziotransport.html

Lazzi
Intercity bus company with routes to various cities including Florence, Lucca and Pisa.
http://www.lazzi.it/eng/activenews.asp

Odyssey Tours
Operates bus tours in Rome and further afield.
http://www.odyssey-tours.com/

SITA
Website of one of Italy's main intercity coach operators. Italian only.
http://www.sita-on-line.it/

Sulga
Operates a coach service to several major cities nationwide.
http://www.sulga.it/