Parma is linked with other italian and european cities also by bus. On the website www.busradar.com you can find the most important italian and european companies to travel from and to the city of Parma.
There is also a page dedicated to Parma where you can click directly on the most frequent linked cities.
On the same website there’s the possibility to find a car to share for the destination required.
Many connections from Parma also with Flixbus, the German bus company operating all over Europe on internet and low cost.