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So many to choose from...Linux, Syncthing, Vim, Firefox and Thunderbird/K-9 Mail, Keepass and derivatives, GrapheneOS, Inkscape, VLC/mpv, yt-dlp...there are just too many daily drivers to name them all.
Vim wouldn't even have occurred to me if you hadn't said it. I use Vim more than I talk to my family.
Exactly, text editors are such everyday staples and yet it's easy to take for granted that they are open source. Vim is often the first package I install on new systems when not already present and, outside of my web browser, is certainly the program I use most.
On that note, I'll add Markor to my favourites list. It's absolutely the best Android markdown editor/viewer I've found to date, and it works beautifully with Syncthing folders.