Choosy - is a must for me. It lets you select the browser/profile after clicking on any link or define the rules for opening them. For example, if a link contains a certain domain or it's source application is Slack, it will be opened in Work profile of your browser.

Obsidian - note taking, making presentations for work-related stuff.

iTerm 2 - it's better than default terminal emulator, but i consider moving to Alacritty to see what's so hype about it.

Scroll Reverser - macOS still doesn't know the difference between mouse scrolling and trackpad scrolling.

While i can't recommend Arc browser, i still use it daily. I don't believe it will exist in it's current form in two years, but now it's much more usable than other Chromium-based browsers for me.

I also have a simple shortcut in Siri Shortcuts that calls m1ddc tool to change the external monitor current input between HDMI and DisplayPort.