Spain, Shetland, Channel Islands too. Sadly the old overnights to Denmark and Norway no longer run.
Loads in the Baltic and Mederteranian too, Spain to the Canaries and Mallorca, Sicily to Naples, Venice and many other Italian ports to Greece, several in Greece. Alas no longer a ferry from Greece to Cyprus/Israel/Egypt.
Bulgaria to Georgia too [0], cross the caspian sea [1].
I really wish the ferry over to Norway still ran, but the one I just missed by a couple of years ran from Denmark up to Shetland, then to Faroe and Iceland. I had wanted to ride up to Shetland and then take the bike up further. I think you can still do it as a foot passenger, but there is no vehicle service.