The Oslo Ferries are the ferry boats from Vippetangen to the islands of the inner Oslo Fjord. There are also ferries from Rådhusbrygga (behind City Hall) to the Bygdøy peninsula.
Line 91: to Dronningen and Bygdøynes at Bygdøy (summer only)
Line 92: to Hovedøya, Lindøya vest, Nakholmen (all year)
Line 93: to Bleikøya, Gressholmen, Lindøya øst, Hovedøya (all year)
Line 94: to Langøyene (summer only)
All Ruter tickets (tickets for public transport in Oslo) are valid on the ferries. You can also buy a special island ticket (Øybillett), which is a day pass for the boats to the islands - perfect if you want to go island hopping.
The Oslo Ferries are operated by Marine-Service.