Hacker News Reader

Check out the hardware info in this screenshot:

"High end expensive workstations" with 25-MHz 680x0 processors.

OpenStep ran on a 486 without FPU.

exactly. it would be a bit anachronistic but you could conceivably run NeXTSTEP on a 486 without a FPU right now https://github.com/trunkmaster/nextspace

You don't need an fpu at all to draw those bezels do you?!

No, but the Nextstep UI was generated with PostScript, so lots of floating point and rasterizing. It basically treated the screen like a PDF.