OsmAnd for obvious reasons.
Breezy weather, cause goddamn is it nice to have an actually good weather app that doesn’t want the most bullshit permissions that a weather app shouldn’t ever need access to.
Image Toolbox - it’s pretty nice.
Cool Reader - dead project, it’s successor KnownReader isn’t on F-droid, but it doesn’t matter much. I still haven’t gotten completely used to known, cool works perfectly fine and it has been my e-reader of choice ever since the j2me days.
Your local print shop. Or, if you happen to have a printer at home, esp an inkjet, at you own home.