Organic Maps is brilliant. I like that you can export and import your places, and that you can have multiple sets of place, plus offline everything, and it's so nice to not have any tracking or ads. I use it almost daily. I like the ability to route from and to any two points, independent of where you are.
I can also add:
LibreOffice Viewer which allows you to open any Microsoft Office document (excel, word, etc). It's handy when someone emails you one of those and you need to have a quick look on the phone.
Organic Maps is brilliant. I like that you can export and import your places, and that you can have multiple sets of place, plus offline everything, and it's so nice to not have any tracking or ads. I use it almost daily. I like the ability to route from and to any two points, independent of where you are.
I can also add:
Etc... there are plenty more, but those come to mind, all open source, and great