- On iTerm2 you can setup a system wide hotkey to toggle a floating terminal in front of all your windows, whatever you're doing [1]. This works even in full screen apps. It really changed my workflow with iTerm, and is really handy.
- For system stats in the menubar, I really recommend iStat Menu [2]. It's paid (12$ for a license), but the quality of the graphs and interface makes it well worth it imo.
- If you have an external display and want to precisely tweek your resolution, I recommend SWitchResX [3]. It's mostly a GUI that wraps some display CLI tools. With it I adjust the resolution of my 4k external monitor currently, running it at 3200x1800 with HiDPI, and adjust it based on my eye fatigue.
- As a more powerful and versatile replacement to Spotlight (Cmd+Space), Alfred [4]. You can customize it to run anything you want, from converting timestamps to dates, opening apps, search the whole system, run scripts, etc
- If you have too many icons in your menubar and want to hide some (either totally or behind a button click), Bartender [5]
[1]: https://apple.stackexchange.com/questions/48796/iterm-as-a-s...
[2]: https://bjango.com/mac/istatmenus/