Must-Have Linux Apps

Basically the title.

Here's a quick background, though (because I have nothing better to do today). Suffered a failed EOS update on my laptop and it refused to boot. Rather than fix it, I decided to do something I've been thinking about for a while now: I installed NixOS (I still use Arch on my VM, btw).

Problem is it's been a bit long since I last set up my laptop I can't remember everything I did on it. Lol.

So what do you guys install after changing distros? What are your must-have applications (for any distro)? I'm already running zen kernel, got bitwarden up and running, hardened firefox and installed ungoogled chromium. Seems there's no standalone pihole (yet?) for Nix so I'll be checking that out as well. Thanks in advance for your input!