NotallyX. Basically free, open source Google Keep, for anyone that enjoys that app.

screen

a gnu until that let's you run a persistent session, even if you log off. log back in and reattach your screen and whatever you were doing is still running.

PieFed: a link aggregator and forum platform built for the Fediverse, focusing on individual control, safety, decentralized power, and healthy community interactions, with features like reputation indicators and keyword filters to enhance user experience.

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

TerraForge3D, is a procedural terrain generation toolkit as well as a procedural modellling toolkit. TerraForge3D is suitable for modern 3D Environment design.

https://jaysmito101.github.io/TerraForge3D/

https://github.com/Jaysmito101/TerraForge3D?tab=readme-ov-file

Flameshot: screenshotting tool with everything you would ever need for screenshots

Xournal++: A C++ handwriting note-taking software with PDF annotation support.

krusader is a dual-paned file manager for KDE. It runs on Linux (of course), MS Windows, and Mac OSX.

Folder sync is what makes krusader outstanding, even if you don't care about dual-pane file management. Open the two folders you want to sync in the panes and go to Tools > Synchronize Folders. You can synchronize both ways, exclude files, delete lone files, etc. Very powerful.

Being a KDE app, krusader does not skimp on features, so there are lots of other things that krusader can do.

link: https://krusader.org/

Nicotine+: A lightweight, free, and open-source graphical client for the Soulseek peer-to-peer file-sharing network.

Changedetection.io: track selected websites for updates or price changes

Mullvad vpn, probably the best vpn imo

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.

Helix Editor: A fast, post-modern text editor that combines modal editing and syntax awareness built in Rust for programmers.

Audiobookshelf. Not exactly a "hidden" gem at this point, but I'm putting it here for today's lucky 10,000. Simply the best way to store and stream audiobooks. Does podcasts too, and ebooks, although there are better tools for those.

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

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).

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

Nuclear: A free, open-source music player that streams content from multiple free sources like YouTube, SoundCloud, and Bandcamp without ads or subscriptions.

Comaps, navigation from openstreetmap