This may have been mentioned way back in the history of this forum, but I didn't see it in recent history so thought I'd give it a bump.
This is the MUST HAVE app for traveling in Europe - or almost anywhere, for that matter. It's a free app, there is both a web and mobile version. Just put in your starting point and destination and it will give you all the options - such as car, taxi, ferry, train, plane - and give you time and cost comparisons of each. It even has links for booking some of the options.
I see so many queries on the forums here asking how to get from Point A to Point B, so I realize lots of folks don't know about this app. It would answer about 99% of those questions quickly and easily!