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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It wouldn't be hard to build something like this for the Mac either. Looking for a few minutes I found Stats, which is MIT-licensed. A lot of people use paid apps for this too, though, and that's not necessarily a bad thing. On the Mac there's a vibrant community of small companies which make nicely-crafted apps (often using the shareware model) and sell them to users. Bjango, the company that makes the popular iStat Menus app that I assume was recommended to you, is one of them. It's hard to make money working on open source, and it's awesome that so many people are willing to do it for free, but it's also awesome that thousands of developers can build useful (and often beautiful) apps and earn enough money from them to work on them part time or full time.
Plenty of people use iTerm, a popular alternate terminal. There are also some open source terminals, and if you have an X server installed you can use any of your favorite X terminals as well (rxvt, gnome-terminal, xterm, whatever). I find Apple's terminal colors work fine for me in xterm256 mode, including in the color-heavy fish shell.
My suggestion is Amethyst. Works without disabling SIP, unlike Yabai. It's not perfect, sometimes it freezes or crashes, but most of the time it works ok.