• mpv (video player)
• Logseq (knowledge base/journal)
• KISS launcher (android launcher)
• OpenTracks (fitness tracking)
• BreezyWeather (weather)
• KDE connect (app to do shit between pc and phone)
• Tasks (todo)
• AntennaPod (podcasts)
• Hacki (hacker news)
• FlorisBoard (keyboard)
• Unexpected Keyboard (another keyboard)

Syncthing.

Somewhat self promoting for the first two of these items as I'm directly involved. Leaving out the more obvious ones (Linux distro etc.) as they will have been mentioned. I'll stick to some of the less known things I use.

• Pulsar - a community-led fork of the discontinued Atom text editor. Lemmy community
• Joplin - note taking app. Lemmy community
• Halloy - IRC client built in Rust and Iced
• Navi - Command line cheatsheet tool
• GitUI - Terminal UI git tool
• Skim - Fuzzy finder
• Dust - Disk usage tool (like du)

Vim

• Termux
  Holy hell. So much it can do. Right now I am using it to transcode MPEG2 videos to AV1. With CRF 25, Preset 5, with a 480p30 video I get 5fps in Termux on my older Snapdragon 860. Meanwhile my laptop's Ryzen 3 3200U does 2fps.
  You can run different server applications. Some are supported natively (e.g.: Tinyproxy, Privoxy, Squid HTTP proxy, apache2, nginx, navidrome, OpenSSH, TigerVNC, rsync, xorg-server, xwayland, xrdp,...) and some can run in proot (e.g.: Jellyfin, NextCloud). If you already have some web server and want it public, there's cloudflared too, so you can access it via Cloudflare tunnel.

• RTL-SDR driver
  Allows connecting RTL-SDR on Android and starting RTL-TCP server.

• SDR++
  The best general-purpose SDR app available on Android, GNU+Linux, Windows and MacOS.

• KDE Connect
  Nicely connects phone with a computer. Data transfers, remote control, finding your phone, synchronizing notifications.

• LibreTorrent
  Great client for Android.

There's more, but those I don't use daily, or have already been mentioned.

• Fluent Reader – to very quickly get a lot of news which I need for work
• Beeper – for the 100 chat apps I need to use to stay in contact with my friends who don't use Matrix
• Nheko – for the based friends who have [matrix] accounts and chats with industry professionals in my field
• FluffyChat – mobile device [matrix] client
• Logseq – as second brain, works better for me than Obsidian
• Jameica – for online banking and accounting
• K-9 Mail / Thunderbird – mail client
• DecSync CC – for synchronising contacts with multiple devices through Syncthing
• ActivityWatch – to track everything I do in case I forget to book time in my corporate time sheet, or if I want to know how long I played games in contrast to programming
• KDE Plasma – best desktop environment boosting my productivity to about 140% of what I could do with Windows 10
• Qalculate! – very fast and easy to use scientific calculator, can also do conversions like "1h50min → min" or "15€ → $"
• Aegis – TOTP generator for mobile
• VLC – plays everything you throw at it
• mpv – plays everything you throw at it, if you installed the right codecs, and also does fancy ML-based GPU upscaling in my case
• KeePassXC, KeePassDX – password managers integrated on Desktop, Laptop, Tablet and Phone
• Syncthing – to automatically and seamlessly sync all my devices (Laptop, Desktop, Tablet, Phone, second Laptop, Servers, …)
• Firefox Developer Edition, Librewolf – browsing the web without Chromium
• Chromium – for PWAs like Teams, Outlook, Discord

Well, there's the usual: GIMP. Lemmy & Firefish instances. Linux OS. Syncthing. Firefox. Inkscape.

qOwnNotes is cool and I don't hear much about it.

Also shout out to libre games. GZDoom and UnCiv mostly. But MOSTLY GZDoom. GZDoom is a platform, not a game.

Firefox

NewPipe fork with SponsorBlock

LibreWolf

Hey I use my own app every day. Let me tell you about it. :)

nephele-serve is the dedicated server version that I use to manage all my Jellyfin movies and TV shows. I also back up all my systems to it with DejaDup.

QuickDAV is the desktop app version that I use to transfer files around all of my way too many PCs, tablets, and phones (I develop mobile apps too, so I have a lot of devices). It’s easier (and usually faster) than using a USB stick, and it’s safer than leaving shares open all the time.

They’re both open source and use the same server software, Nephele, that I wrote for my email service, Port87.

Oh I’m also working on putting up a Docker image for nephele-serve and a Flatpak of QuickDAV.

No mention of Thunderbird yet??

That's a very very long list...

Debian + Cinnamon desktop which inck7des the countless tools that come with that stack.

• Termux on my phone
• Zsh as my debian shell
• OpenSSH
• OpenVpn
• tmux + tmuxinator
• neovim, and dozens of plugins/tools with that
• dart
• flutter
• large chunks of Node.js and the npm ecosystem
• dotnet framework and countless nuget packages
• lazygit
• stable diffusion
• llama.cpp, and many tools built on top of that
• k3OS running Rancher
• my entire selfhosted stack on the above which includes but is not limited to:
  • Shinobi
  • Bitwarden
  • Gogs

I'd finish earlier telling you which of my software is not open source.

Daily basis:

• SteamOS
• Rasberry pi OS,
• Firefox
• Chromium
• Gnumeric
• Jerboa

Almost daily basis:

• ffmpeg
• streamlink

MakeMKV! I primarily rent Blu-Ray from my library and sometimes enjoy it enough to rip it and keep it (for personal use)

Daily:

• Signal
• GrapheneOS
• Bitwarden
• Firefox/Mull
• VPN
• Baserow

Not daily:

• Lemmy
• Mastodon
• Pixelfed
• Invidious
• Cryptomator
• Aegis
• Penpot
• Aurora
• LocalSend
• OSM
• Obtanium
• Voyager
• Open Video Editor
• OpenScan
• Cryptee
• Element

On my server:
OpenMediaVault (NAS OS based on Debian)
Syncthing
Home Assistant
Zigbee2MQTT
Docker
Portainer
Radicale
Navidrome

On my phone:
Syncthing
Tailscale
Feeder
DAVx⁵
OSS Document Scanner
RPNcalc
DSub
EDSY

On my PC:
Odyssey Material Helper
EDDiscovery
EDSY
ObservatoryCore
Paint.net and GIMP
OpenRGB
Tailscale

I use Aniyomi, Fennec, Obtainium, Jerboa, BetterUntis, Bitwarden, DroidFS, Aegis, LibreTorrent, Shelter, Survival Manual, Termux, ConnectBot, LocalMonero, F-Droid, RethinkDNS, InnerTune, Mastodon, Kuroba-Ex, Signal, Element, QUIK and FlorisBoard

AnkiDroid

Does anyone know of a FOSS file explorer for Android that supports network locations? Fossify file manager would be perfect but doesn't have support for network locations.

Element

Some subset of modern Linux distro - Firefox, Emacs, Git, Tmux, OpenSSH, i3, sway... Android - F-Droid stuff

Habits

Nextcloud

Jellyfin

On mobile:

• Feeder (RSS reader)
• K9-Mail / Thunderbird
• Mull (Deblobbed and privacy oriented Firefox Mobile fork)
• Catima (Loyalty card manager)
• Cofi (Coffee timer)
• Neo Launcher

On desktop:

• Spotify-qt and Librespot

I use a bunch of other stuff as well but these are the one I truly use daily that haven't been mentioned yet.