Why software do you use in your day-to-day computing which might not be well-known?
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for shopping receipts, notes and such, I write them down using vim on a small Gemini PDA with a keyboard. I transfer them via scp to a Raspberry Pi home server on from there to my main PC. Because it runs on Sailfish OS, it also runs calendar (via CalDav) and mail nicely - and without any FAANG server.
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for things like manuals and stuff that is needed every few months ("what was just the number of our gas meter?" "what is the process to clean the dishwasher?") , I have a Gollum Wiki which I have running on my Laptop and the home Raspi server. This is a very simple web wiki which supports several markup languages (like Markdown, MediaWiki, reStructuredText, and Creole), and stores them via git. For me, it is perfect to organize personal information around the home.
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for work, I use Zim wiki. It is very nice for collecting and organizing snippets of information.
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oh, and I love Inkscape(a powerful vector drawing program), Xournal (a program you can write with a tablet on and annotate PDFs), and Shotwell (a simple photo manager). The great thing about Shotwell is that it supports nicely to filter your photos by quality - and doing that again and again with a critical eye makes you a better photographer.
yt-dlp is my go-to for interacting with YouTube. Super helpful.
LibreOffice Draw can be used to modify PDFs, so I typically use it to fill out forms (whether they're "fillable" or not).
A lesser known one: QDirStat helps visualize the size of different folders on your PC. Great when trying to figure out how you managed to fill up that new 2TB drive in a couple months.
For cli oriented folks, ncdu is a great cli alternative of QDirStat
Oh! I also use SyncThing quite a bit. It's one of those things that "just works" in my experience, and has clients for every device.