What about simple calendar with the agenda widget?
lckdscl
uBlock origin and CanvasBlocker/JShelter are probably enough. There's also uMatrix, which gives you more granular control over what to block or allow.
Subsonic-based alternatives are good too. Navidrome and gonic, for instance.
Hmmm, that isn't open source, I don't know if one can trust it. Why does a browser need in-app purchases? Try Mull or Cromite.
Edit: from the description, it uses Brave Search (to answer you question), so it doesn't send to Google your queries. But I'd be careful with an app with a bunch of SEO keywords in its description.
koreader is good if your platform supports it.
I use a second-hand kindle on airplane mode and just transfer books to it from calibre. E-ink is better for my eyes.
Sorry, lengthy answer because difficult question.
How I stop worrying about Nvidia and deal with it
I have voiced my frustration with Nvidia elsewhere, and there are still annoying bugs, that no one can fix because it's proprietary, but I live through it because I love everything else on Linux.
I like that using Linux makes me more careful, I learn things all the time, I stopped feeling entitled to many things. The idea of a software is changed dramatically, it's a code as an MVP, then built up slowly based on what the dev wants, as they often use the projects they maintain themselves, or contribution and requests from their users, which is so much more sustainable than what you get in the for-profit, proprietary domain.
For this reason, I avoid negatively talking about small community-driven foss projects on the internet, because I can be actively constructive by being the change I want to see, whereas on Windows I would be stuck with a subpar product with no source code to investigate.
I think in your case, and please don't take it personal, we don't know each other, I don't know what you're going through or how you are as a person, I'm making a small judgement based on word choice here, but calling something "trash", even after you know it's made by someone who probably wants to use their streamdeck on Linux (just like you) is quite a hostile thing to say and will invite some hostility back. I would retract it but you do you.
Caveat Now, some foss devs are whirling shit against each other all the time on their personal blogs but that's within their own dev-dev domain, not user-dev domain. Say hypothetically if you start contributing to streamdeck-ui and the Dev starts being an AH then you can fork it and maybe then go online and vent.
Why forums appear toxic
I can admit some forums read very blunt and impatient, like BBS Arch Forum, but they only exercise patience when it's a big they've never seen before, and will ask you to paste all sorts of command outputs to troubleshoot, otherwise, they are quick to recognise if the problem have been encountered, and will typically send you to the link of the solved post or tell you to RTFM because it's somewhere in the manual. To be frank, this behavior I can understand and have no issue with.
On more general forums like this one, it's often the case users ask question that they can do some precursor research and once stuck (no mention of issues anywhere, no similar thread), then if they do post, I've only seen poor quality comments like "works for me" or "same but idk the fix", since the commenters will have to do the same searches the poster did and come to the same conclusions (here, it's nice to send them links you researched to save them a few clicks). I've made similar posts with great details on what I tried but it's still broken. If no one knows, then I open an issue.
Now, if they didn't do research beforehand, commenters will look it up and then have to correct you but they might feel annoyed because why didn't you do it before posting. Not everyone will be bothered by it. But I do feel like a search or two beforehand will bring a much more fruitful discussions.
I won't defend inflammatory toxic language, but I don't think there are any here present in this thread, it's just a lot of "AcKtuaLLy" comments, but those were done to correct you and if I were you I don't think I wouldn't really get all defensive. I pride my time using Linux, and other commenters probably do too, but we all started somewhere so we know when we see the "I didn't do my research but gonna post anyway" attitude. If one likes doing this, just get ready for people who want to correct things, I guess.
It's a kind of tough love here where it's heavily encouraged that one does their own heavy lifting instead of relying on others. At least that's what I've observed. It might be negative, but it's better being spoonfed. I've managed to avoid such negativity by trying to exhaust all options before posting for help. I learned so much and I hope you find a way to approach Linux that works for you! There are still others out there who aren't jaded by newbie questions and still will help, just don't expect their language to be nurturing.
Also, please consider ignoring internet points, they do nothing but makes you feel distressed. In places like this it's a bit like on Hacker News where it's to show if a comment is helpful/ constructive, or not. It's not personal.
You looked it up but didn't realize it was made by one guy, if you have been on the repository you would've seen that!
I'm just saying please look up everything you install, and around it, what language it is written in, whether or not is being maintained, how many issues in the issue tracker, do they have their own support group via GitHub discussion, Discord, IRC, matrix, discourse, or whatever, then ask there if you need help. I know Reddit sucks but there's the Elgato one with existing Linux discussions that you could've seen if you searched "streamdeck-ui linux", at least with my search engine, relevant Reddit links came up second for me after the documentation with the dev's name in the URL.
I meant you as in general you, not specifically you, i.e. Linux isn't for you yet IF the antecedent clause applies (one is not patient to wait for new features, can't submit PRs, which is a valid reason for some people with limited time due to family and stressful job), I didn't say or judge that it isn't ready for you.
IF you want more features, THEN please wait OR contribute, ELSE windows is perhaps more suitable if the streamdeck windows program has crucial things you need.
Also, please don't assume expensive hardware = Linux support as well, not to come off mean-spirited, but because it will save you disappointment in the long run. I'm sitting here with an Nvidia GPU which is expensive and Linux is laughing at me. So don't assume the same for other proprietary hardware, instead, bring it up with Elgato if you think you didn't get what you paid for.
Please look up what you're using next time, and keep in mind that on Linux, a lot of GUI tools for hardware config are community made, so you're lucky someone already tried to make something for the streamdeck. With the exception of big software backed up by an organisation, most utilities started by one or two devs start small and are not perfect, but will get better over time as PRs and maintainers come in, so you also have to be patient and work with what you're offered, or submit PRs yourself to improve it. If that's something you can't do because of time or whatever, then in the long run Linux isn't for you yet.
Documentation for the streamdeck
Tip: when looking up a software for Linux, append Reddit at the end, like "streamdeck Linux Reddit", plenty of people have already discussed this exact software and some others. Hope you find the tools you need.
Sigh...Seems like every time Proton gets criticized, their fanboys always ensure to let you know that you're somehow wrong. I don't know how they managed to get recommended by so many people considering they provide unaffordable services for everyone not on a high income. I would try to migrate if I were you, they're pumping new features constantly despite their users wanting bugfixes and improvements to existing ones to gain more and more ecosystem users. It's a dark pattern. Look at Google and Apple.
"Oh, what about the free-tier?" It's a joke having to use their own clients when powerful open-source ones exist. "Oh, but it's because of the encryption that's protecting you!" I know how to use PGP, thanks. Plus, it only works if you're sending to other Proton accounts, and guess what? I don't even have control over my own key pair! (Edit: and when migrating away, I can't even bulk export my emails!)
Even the comments made by me and Dsklnsadog got vibe-based downvoted because they can't even bother to come up with a response on why our opinions were wrong. I'm glad I stopped using their services before I sent them any money.
+1 for Netdata, very fast and a lot of alerts have already been set-up. It also has a lot of plugins, as well as the ability to use Prometheus metric endpoints. The local dashboard is near parity with the cloud one, and setting it up is as easy as running their bootstrap scripts. There is decent documentation too, if one gets stuck.