I use Librewolf for all of my personal browsing

Sonarr, Radarr, Lidarr, Readarr, and Prowlarr.

Not entirely software, but the MiSTer FPGA project. Having accurate zero-lag hardware accurate versions of almost every console, many arcade games, PCs (Amiga, Commodore etc), and handheld up to and including the PlayStation in a box the size of a game boy is unreal.

Majority of the project is open source, and has been used for ports to the analogue pocket handheld, which I also have and use often

Blender

OsmAnd

Godot game engine without a doubt.

I couldn't get by without AutoHotkey and AltSnap. Especially having extra buttons on my mouse, there's so many custom shortcuts, commands, controls, etc. that I couldn't make without them. AltSnap also has a built-in borderless windowed button that works better with games than some apps I have used that are explicitly for that purpose. I have shortcuts for changing volume, switching windows, toggling always-on-top, and even making windows transparent all from the mouse.

Linux, MPV, Proton, bash, Newpipe

Pihole, Kubernetes, ffmpeg, VLC, pretty much we are so technologically advanced because there is so much free and open source software. If it wasn't for it we would be ages behind technologically.

archlinux firefox thunderbird emacs

A few of mine that I use daily...

Networky Things:

• Caddy
• Tailscale
• Headscale
• Go Simple Tunnel (GoST)

A couple of personal projects:

• Skyhook (Data exfiltration server)
• Eavesarp

Gotta go with python here, though vim would be a close second.

Subsurface

Its dive planning and dive logging software. It's also the only software I'm aware of that can actually pull the data from my dive computer, which uses some crappy proprietary cable and software. The fact that subsurface exists and is automatically in Linux repositories is what finally allowed me wipe out my aging and barely functioning computer, and revive it with Linux.

Infinitime, for my PineTime.

Hyprland So much fun

youtube-dl

OBS is my one of my favorite softwares in general, let alone open source

Firefox, Libreoffice, and Bitwarden (I would include Zotero, but idk if it's open source)

I'unno. Don't really think about it that hard.

I guess firefox, since it gives me ~~porn~~ access to websites.

Freecad. It's a little rough to use compared to professional cad products I've used but it can really do a lot. In a lot of ways it feels less constrained than some of the stuff I've used too

KDE Plasma desktop

Bitwarden & Jellyfin

GNU Hurd. Never used it, but I like the idea and would love to see it become a viable option.

Wine, despite the headache that is fiddling with its configurations for specific older games to work.

Dolphin Emulator always amazes me in how perfect of an emulator it is.

I’ve been using Logseq after trying Notion and Obsidian a good bit and I’m really enjoying it. It’s a block-based note app that makes connecting thoughts together super easy. So far so goo!

Debian

Since most of what I would have said has already be mentioned I will just go with almost anything under the umbrella of the KDE organization.

As in the Plasma desktop environment and the whole application suite. Includes programs like Krita, Kdenlive and KDE Connect, plus the whole range of "standard" desktop applications like terminal, file manager, document viewers, etc. pp.

And the DE itself is just adorably hackable. Want to replace the Kwin window manager with i3? Sure it's possible, here you go: https://userbase.kde.org/Tutorials/Using_Other_Window_Managers_with_Plasma