Have you considered asking the question yourself and explaining in your post that you are seeking for actual recommendations instead of expecting them in a post with a one-line random question like this one? Maybe?
Most “ITT people” love to help with “ITT” matters, but also enjoy throwing quick answers in posts like this. Just a heads-up.
OpenStreetMap is a free, editable map of the world, created and maintained by millions of volunteers. It includes data about roads, buildings, shops, points of interest, and more.
Many of the benefits of Google Maps without all its spying and advertising.
Bonus in line with this: OsmAnd.
Edit: a more lightweight, but fully FOSS OSM client: Organic Maps. Blazing fast and under constant development.
Edit 2: Here is a Lemmy community dedicated to OsmAnd: !osmand@lemmy.ml
Libby, the ebook reader app that is synced with my library card! It works quite well, and though I technically pay for my public library via taxes, the app is free and fantastic!
Darktable photo editing software. It has an awesome suite of features and functionality and supports almost every digital camera raw format.
Bitwarden is one I use several times a day. They do have a support plan for like $10 a year that gives a couple extra features like TOTP support, but the base level is incredibly robust. It’s open source, too. I know a lot of folks also host their own servers with Vaultwarden, but that’s a little beyond my skill level.