This is about the app that first shipped with PowerPC "Classic" Macs.

As a tech demo for PowerPC performance, it was beautiful.

It was ported to NeXTStep-based macOS with the new millennium.

You can still find an equation graphing app in Applications → Utilities; it's called "Grapher".

I just checked on my MacBook, macOS Tahoe Release Candidate, and the app is part of the immutable /System partition at /System/Applications/Utilities/Grapher.app

First appearing on HN 19 years ago: https://news.ycombinator.com/item?id=1741