I do one of these posts every year or so, mostly for myself — it's useful to write down what's actually in rotation versus what I tried and quietly stopped using. This year the list is shorter than previous years, which I think is a good sign.
Plain text files, organized in a folder structure that I've been refining for about four years. I use a lightweight editor that gets out of the way. I've gone through phases of trying more elaborate note-taking systems and always end up back here. The simpler the system, the more likely I am to actually use it.
For longer things that need to go somewhere else, I write in Markdown and convert as needed. This has served me well and I don't anticipate changing it.
I spend a lot of time in the terminal. I use a fairly minimal setup — a sensible shell configuration, a couple of aliases for things I type constantly, and not much else. I went through a period of heavy customization a few years ago and it created more friction than it removed. The current setup feels stable.
SSH is something I use daily for managing remote servers. I keep a config file with all my hosts so I don't have to remember IPs and usernames. If you're doing any amount of remote server work and you haven't set up an SSH config file yet, it's worth five minutes of your time.
RSS is still my main way of following things. I know that's not a fashionable answer but it works. I have a self-hosted feed reader that I've been running for a couple of years. The maintenance overhead is basically zero.
For longer articles I want to read carefully, I send them to a read-later app and read them on my phone when I'm away from a computer. My read-it-later backlog is embarrassingly large but I've made peace with that.
A project management app I was using that slowly accumulated features until it became something I had to manage rather than something that helped me. A habit tracking app that worked fine but turned out I didn't actually need an app to track habits. And a cloud sync service I was paying for that I replaced with a simpler solution that costs nothing.
The pattern I keep noticing: the tools that stick are the ones that do one thing without requiring much attention. The ones that fall off are usually the ones that want to be a platform.