OsmAnd does, but only for Android users, and only if you set up online routing to work with a particular service (you’ll need an API key for something like GraphHopper).

To enable this, on Android:

• Go to the menu -> Settings
• Click on your “Driving” Profile -> “Navigation Settings” -> “Navigation Type”
• Select “Online”
• Select “+ Add Online Routing Engine”
• Choose your routing provider that handles traffic data and enter an API Key

Even then, I find OsmAnd to be lacking because it doesn’t show me multiple options for routes, but at least I can get the best recommended route based on live traffic data.

I know they are working on plans for this, but I’m not seeing any traffic functionality in the app today. Unless I’m missing a setting somewhere?

It’s a web app, so it can technically be installed, like Voyager Lemmy/PieFed.

https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Guides/Installing

It’s kind of like a middle ground between a full app and a browser bookmark. This has the advantage of making it compatible with both Android and iOS, or you can just use it through a normal browser.

Edit: correction on Voyager -> Lemmy/PieFed.

I’ve used OsmAnd+, Organic Maps, CoMaps, MapComplete, etc.
My favorite app that I’m looking forward to is CartesApp. Unfortunately it doesn’t have an English translation yet. It’s only geared towards French users for now.

It has an interface that’s very familiar to Google Map users, and clicking on locations brings up the kind of information you’re used to when using Google Maps.

https://cartes.app/

https://codeberg.org/cartes/web

Edit: That being said, the web app works fine for me when “installing” with a browser that has a built-in translation service.