The best replacement for ferries is stena line.

The best alternatives to ferries are rated as following:
★★★★★  stena line
★★★★  ferries
★★★  aquabus
★★  celtic link
★★  sncm
★  eurotunnel

Your alternative for ferries is not listed? Suggest!
Speaking about ferries, one probably shouldn't forget about eurail pass.

Other search terms related to ferries and their ratings are:
★★★★★ eurail pass
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