Zen looks nice and some of the UX concepts (workspaces, glance, split sidebar from vertical tabs) work well. The ‘fit & finish’ and the way changes are pushed (unilaterally? Unvalidated with endusers?) feels very much like a 1 man hobby project though.

Can also try Here Wego. It looks a bit more polished and I have better success using its search function. Only downside: spoken navigation instructions are TTS only and sound quality is bad over Android auto…but I have them disabled anyway.