Asklemmy

Definitely OpenFOAM. It competes with commercial software that costs thousands of dollars.

OpenSCAD and Gitlab. I can quickly iterate on designs through code, push it to my Gitlab instance, and have my CI/CD pipelines pick it up, render it, and automatically slice it in some common profiles to send to Octoprint

Linux, Tor, and the Ballistica game engine/BombSquad game (not fully open source as stuff used for sensitive data remains closed source 😔)

Edit: forgot git lol

vim

Currently OBS and Motrix

Linux Mint and Bit Warden are the obvious picks, But I’ve really been enjoying NetNewsWire on iOS since the decline of Reddit. RSS is a great protocol, and NNW is a very seamless experience. When I find a link to an RSS feed I want to follow, just tap and hold, share, and it auto fills an entry with everything but a title and automatically adds it to your feed. Great stuff.

Neovim. It's an awesome editor and it has a great community and ecosystem.

Linux, of course. But another one that I use all the time, and love to death, is SageMath. It's the perfect blend of mathematics and programming for me.

QGIS and OpenStreetMap for mapping

https://www.kicad.org/

yay

Firefox, Neovim, Pass (password store) and Wezterm. I heavily use all four of them.

I also need to give a special mention to Aegis Authenticator on Android.

VS Code

ShareX and it isn't even close

Helix text editor.

uhh probably uhh AOSP and calyx os

Linux, Firefox, Apache

Hard to answer but maybe Haiku or GNU Emacs

Playnite, all your games in one launcher.

Media Player Classic (I'm unsure if the latest iterations are or even if the Home Cinema edition is open source), TOR, qbittorrent, firefox, thinderbird, obs to name a few that I use regularly.

Right now, it's Warpinator. Makes at-home wireless file transfers so damn SIMPLE.

Bulk Crap Uninstaller

paperless-ngx