You probably hear of #brouter, one of the easy and free to use route planning tool for people on #bicycles. The nice thing about it, is the user is not tied with any particular platform or service, and can generate routes in the ubiquitous #GPX format.
Since it's open source, there are many instances you can choose to use, but the one available from brouter.m11n.de has some cool extra options, additional profiles to choose from, and sharing routes as QR codes.
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