What Free Software Is So Good You Can't Believe It's Free? (Reddit)
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database stuff like postgres, sqlite is especially lovely for portability and ease of deployment.
Firefox, libreoffice, gimp, vlc, and Linux, Ubuntu particularly.
evince and calibre
compression software / archivers like 7zip
cli stuff like mosh, irssi, and htop.
i essentially no longer use proprietary software not out of any moral or economic stance, but just because it either does less or is vastly less extensible or takes too long to deploy or can't be trusted.
open software is wonderful.
Many mid-sized Python projects use libraries that I’d guess together represent somewhere between $2M and $200M in developer hours - depending on whether you’re using frameworks or just relatively simple libraries.
2. VLC and it's dependencies
3. Linux!!
4. Vscode
5. Node
6. GCC, Clang, Cmake ...
7. Git
8. Chromium
9. Webassembly, emscripten