Almost all alternatives use OpenStreetMaps. I prefer Magic Earth but all of them are similar enough
The main issue is OSM. They lack many addresses (varies A LOT among different countries, some are fine) and POIs. Please consider contributing yourself, because it depends only on volunteers!
It is SUPER easy. Just download StreetComplete on Android to add multiple different info in a very easy way (or just house numbers which are the most important info) and EveryDoor for POI editing/deletion/addition in just a few clicks. And don't worry if you don't input something because you aren't sure as long as what you enter is correct
The FOSS ones suck in comparison honestly. There's really just osmAnd that has a really ancient UI. As for other OSM(OpenStreetMaps), I find MAPS.ME to be the best, but it's closed source with some crypto scam crap built in that you can't disable.
I don't really like OSM based maps because they miss tons of places where I'm at, when I specifically need building numbers and locations. Also the search on both apps is god awful and straight broken.
Google Maps is definitely miles ahead of the competition here. The other features like seeing how busy businesses are, reviews/images, menu and phone number/website. These are also icing on top of the cake that make it essential to have which none of the competition have, let alone any FOSS ones.
I use Organic Maps on my degoogled pixel. Does not have quite as much data as google maps, but works really well for navigation and uses openstreetmaps' data.
FOSS turn-by-turn is unfortunately not great. I like the proprietary app HERE, because it works well for turn-by-turn, is based in Europe and has a privacy policy that fits on one page
magic earth for regular use and herewego if openstreetmap doesn't have data and I'm in a hurry
both are proprietary but way better than google
I also input data in openstreetmap if it doesn't have it from gmaps webview(by divestos) so I can use it in future without relying on proprietary services
maps.me has been pretty good - they occasionally try various ways of monetizing it (the most recent one seems to be some kind of limit on map downloads) but it was a pretty straightforward OSM viewer with basic routing and searching.
All the alternatives have poor search functions e.g. fuzzy search. After trying them all I use magic earth but will often find I have to get addresses out of google maps then put them into ME
Magic Earth. I've tried every other major OSM google maps alternative and none have been as good as Magic Earth.
Osmand, Maps.me, Organic maps, and one other I can't remember now, used them all. I still use Osmand because I'm trying to support the project, but Magic Earth by far has the best address searching, best UI, best directions, and limited but existing live traffic data to help you avoid really bad backups.
Now I'm in the USA, and some folks say some of these apps work better in Europe, that's fair, but that's still my point, Magic Earth. Not FOSS, but privacy respecting and uses OSM data. If you wanna break away from Google but aren't willing to deal with a bunch of jank, Magic Earth is your friend.
For traveling I often use Here We Go maps, because have more information than Magic Earth (buses, trains, more info about restaurant / eating / sleeping accomodations - links, prices etc). In my country I use just Magic Earth.
I live in south korea, and unfortunately, openstreetmap isn't enough for daily usage on here.
So I am using both. Google Maps(using GMaps WV) and organic maps
For hiking and walking around the city open street map is great. I personally use mapy.cz - they work great and at least in central Europe - more accurate than google.
For hiking and walking around the city open street map is great. I personally use mapy.cz - they work great and at least in central Europe - more accurate than google.
My go to is mapy.cz
You can download regional maps for offline use, it is intuitive to use, good for seeking out cycling routes and builds on openstreetmap data.