simple-scan. Scans documents with zero fuss. Easy and intuitive which is important for software that is not used frequently.

emacs, the text editor. it's so powerful and customizable that I feel listing any feature would do so many others a disservice

Comaps, navigation from openstreetmap

I think android HealthConnect doesn't get enough notice as it is a kind of silent background service.

It is local, opt-in, and privacy respecting connection API for sharing data between fitness apps with fine control over what gets shared where. You can have the shittiest privacy-violating fitness app and it can't just steal all of the data from your smartwatch or whatever because you connect the two apps via a stupid cloud integration.

OliveTin, gives you a clean web UI for pre-defined shell scripts, with a dynamically reloadable YAML configuration.

There are a ton of things you could use it for, but I use it for container and system updates. A pre-processor runs on a schedule and collects a list of all containers and systems on my network that have available updates, and generates the OliveTin YAML config with a button for each. Loading up the OliveTin webUI in a browser and clicking the corresponding button installs the update and cycles the container or reboots the host as needed. It makes it trivially easy to see which systems need updating at a glance, and to apply those updates from any machine on my network with a web browser, including my phone or tablet.

Zathura: A highly customizable, minimalist, and keyboard-driven document viewer supporting PDF, PostScript, and DjVu via plugins.

zoxide: A smarter cd command. Supports all major shells.

This is such a handy tool, and the database can be queried for other tools too. Like project switchers or fzf for example.

CopyQ: clipboard manager with history and pinned items

The UI is a bit janky, but it does the job well.

Pass: a terminal based standard unix password manager.

Breakout71

I could not believe I didn't find this fun free gem sooner. I'll let the description from F-Droid explain the details:

This is a roguelike twist on the original Breakout formula: The goal is to catch as many coins as possible during 7 levels. Coins appear when you break bricks. They fly around, bounce and roll, and you need to catch them with your paddle. At the end of the level, you get to pick upgrades. There are 50+ different upgrades that impact the gameplay in various ways. Many upgrades will impact your combo, that's the number of coins spawned for each brick broken. Your "combo" is displayed on your paddle. Your score is displayed in the top right corner of the screen. Oh, and don't miss the ball, you don't have extra lives.

binary eye, OR code and barcode scanner with no ads

zellij: A modern terminal workspace and multiplexer focused on usability and extensibility, featuring configurable layouts and plugin support.

OsmAnd: This map application is popular enough that it probably doesn't need mentioning, but good golly is it a powerful tool. Great options for downloading maps and having them offline, and while the car navigation might be missing one or two key features that you'd expect from proprietary alternatives (like live traffic), the sheer amount of detail that has been crowdsourced is mindblowing. There are a wealth of trails and cycle routes, low level details like park benches, bridges, and lookout spots, and the various map profiles you can build are very customizable. I'm personally a huge fan of the trip recording plugin for tracking all my hikes, runs, bike rides, canoe trips, and even swims.

FindMyDevice, a find my server with channels through sms, a self hostable server, notifications. This is one of my favorite android utilities.

wezterm: A GPU-accelerated cross-platform terminal emulator and multiplexer written by @wez and implemented in Rust

This is my favorite terminal emulator and very configurable with lua.

Kodi multimedia center.