Maybe it's too much of a nieche, but since this list covers a full photography suite, I think these two softwares are to be added: Adobe Lens Profile Creator (same link as the Adobe DNG converter if you scroll down) and Hugin for making your own lens correction profiles.
https://github.com/slskd/slskd + https://github.com/Lidarr/Lidarr + https://soularr.net/
LocalSend is really good, I have it on all of my devices. Another similar app is PairDrop, which is basically a browser-based AirDrop.
I really wish I didn't see GrapheneOS recommended so frequently. The "former" lead developer Daniel Micay is completely unhinged, and wouldn't put it past him to push out a malicious update during one of his frequent schizo episodes. I'd recommend CalyxOS over GrapheneOS. Haven't heard any drama coming from the Calyx devs.
It takes time if you have a ton of tabs open in Sumatra. Everything else I've tried is just slow compared to it.
I primarily use my browser for PDFs. Although my ebook reader of choice Readest works with them too, you might have better luck with it.
Tutanota is good but keep in mind that you have to log in once every six months or it gets deleted (if you're going to use the free plan); otherwise, hassle-free mail creation. Cockli recently removed its webmail and only works via mail client, so it may not be what you need right now. Disroot works well as long as you don't mind them being unabashed leftists; they might take a while to approve your account and you also have to write about why do you need to use their services, yadda yadda. No experience with lolcow mail. There's one last provider not mentioned in that post, mailfence, relatively no-nonsense mail and also touting privacy, though I don't remember if they delete accounts after a period of inactivity; I made one address on there three years ago and it's still there.
mailfence needs you to add a recovery email. I don't want anything tracing back to me.
Tutanota doesn't require a recovery mail so maybe try that... or there's another option. I just read on /g/ someone namedropping mailum, I signed up as a test and you can create an account without the need of a recovery email. Though the free plan is pretty strict in terms of data (only 50mb of storage, 2 email/hour sending limit, 1 recipient for email). Anyway, as long as you plan on using the email at least once per 6 months, you can't go wrong with tuta, but if you're not sure, try mailum if you don't find the free plan too restrictive.
Koodo, Librum, Alexandria (all three on Linux)
