Bookwyrm, a book tracker and review sharing plateform that is part of the fediverse allowing you to share your notes and review about books in the threadiverse as well as the twittoverse.

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

MusicBrainz Picard: superb mp3 tagger with online metadata lookup feature and audio track fingerprinting

Portmaster, nowadays mandatory, monitor the traffic of all installed apps and even from the OS itself, blocking with a simple click all unwanted traffic, Inbuild DNS crypt with dynamic filterlists (customizable) blocking ads, trackers and unwanted crap from big companies. Optional SPN service (paid). Windows and Linux.

https://safing.io/

https://github.com/safing/portmaster

binary eye, OR code and barcode scanner with no ads

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.

Tox is easy-to-use software that connects you with friends and family without anyone else listening in. While other big-name services require you to pay for features, Tox is completely free and comes without advertising. Chat, P2P serverless, screen/file sharing, voice, video, groups, encrypted.

https://tox.chat/

https://github.com/TokTok/c-toxcore

and lastly, Tor Browser: anonymous web browser to evade state censorship and surveillance

alternativeto.net is great for finding these

Dino: a modern open-source chat client (XMPP) for the desktop.

Logseq: note-taking and knowledge management application that supports Markdown and Org-mode syntax, featuring powerful linking, block-based organization, and full local data storage for privacy

Subsurface

I recently found out after creating Linux, Linus Torvalds wanted to make a good open source scuba dive log software. Today, it's probably one of the best, if not the best dive log programs out there and I recently used this myself on a recent dive and it's great.

Learned about the mentos thing in 2006. Saw a list of things to flavor coke. This was #4 on the list and I decided to try it (yay mint coke) - at a dollar tree parking lot, in my car. Went off in my mouth and I maintained the pressure until I got the door open and my head out. Thankfully little mess on me or the car. Learned the internet can be full of sneaky assholes that day.

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

agate and amfora, a server and client for the text-based "small web" protocol called Gemini. Allows to publish and read text, images and media in a really simple and accessible way.

(Works also great in a local file network to distribute media and docs).

Vassal - an open-source (LGPL-2.1) boardgame engine. basically, people build different modules for each game they want to play, then they can play that game over the internet or solo. Mostly focused on "chit-and-hex" style wargames.

• https://vassalengine.org/
• https://github.com/vassalengine/vassal

MakeHuman is a 3D character creation software designed to simplify the creation of virtual humans through a graphical user interface. The software allows users to create realistic human characters by adjusting parameters like gender, age, height, weight, and ethnicity through slider controls. Characters can be customized with clothes, hair, poses, and materials from the built-in library and exported to 3D soft, like Blender.

https://static.makehumancommunity.org/makehuman.html

https://github.com/makehumancommunity/makehuman

FanControl: superb PC fan manager with custom temperature/fan speed curves and the options to combine sensors whatever way you like

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

PairDrop like Localsend or Airdrop but working on anything that has an internet connection and a resonably new web Browser! You can share files even when on different networks, by pairing devices. Works like a charm.

Warzone 2100 https://wz2100.net/

The first commercial video game to be released in the GPL

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.

NextCloud - Self hosted personal cloud solution that you can run on Docker or bare metal.

https://nextcloud.com/

I already made a list

Markor is a handy fast Android note taking app with Markdown and todo.txt support.

Since everything it creates are text files, it pairs well with various file syncing apps recommend in this thread.

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

Varia is a download manager written using GTK4. Simple, easy, and best of all speeds up downloads significantly on most sites. There also is a extension for Chromium and Firefox, but I haven't tried them.

fzf fuzzy finder. Great tool to quickly find those files you were looking for.

Kodi multimedia center.

Librera (android pdf+ reader).

I spend a lot of time reading pdfs on my phone, this has done an excellent job. Well featured, responsive, and seems respectful of the battery.

Ads or payment if you buy from the playstore, but free on F-droid and source code is here.

ShareX, one of the best Screensho/cast productivity tool, edt tools, OCR, QR codes, scrolling capture, color picker......, storing locally, uploading captures to hosts, sharelink in clipboard. Complement with right click extension for Firefox and Chromium

Sadly Windows only

https://getsharex.com/

https://github.com/ShareX/ShareX