For motorcycle riding i use calimoto. It has an option to find the most curvy route to your destination. It also works offline, which is great when riding in remote areas with poor cell coverage or foreign countries with expensive roaming conditions.

Also it can track your journey and show elevation, acceleration, speed and lean angle.

Unfortunately it’s subscription based now, but i was licky enough to buy it before that, so i basically got lifetime premium account.

One more downside is the shitty search function. even with the exact address copy pasted it almost never finds the location.

Not out of the box, AFAIK, but there is a plugin. I never got it to work though, because you also need some up-to-date certification file.