Why software do you use in your day-to-day computing which might not be well-known?
For me, there are two three things for personal information management:
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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.
Man, I have so many apps, but here are a couple that I install first thing on a new install:
Timeshift is possibly at the top of the list.
Then Deja Dup.
Stacer
Strawberry
Open TV
It could be helpful if you explain what they do and how they relate to your computing needs. For example, I have been using Linux for over 25 years, and the only name in yor list which I have an idea about what it does is Deja Dup (personally, I use tar for backups, in a simple incremental setup).
I know Strawberry, because I use it too. It’s a music player, forked from Clementine years ago. I find it the best for my use case, as it can handle library by tags, do folder view for separate locations, do tag editing, lyrics and art download, etc. Can highly recommend!