I'm partial to the UCSD p-system interface, mostly because it's the first TUI I was ever exposed to. You can see screenshots here:

http://pascal.hansotten.com/ucsd-p-system/cp-m-and-ucsd-p-sy...

As for more modern stuff, I like using ncdu and htop.

Yeah, I have a Python script for personal use, and briefly could not figure out why it was crashing. The reason : I was using

class datetime.date(year, month, day)

which was attempting to generate "today, one year ago" by reusing the current month and day, but replacing the year with year-1.

I like that this article mentions Parnas - I had already thought of him when I saw Modularisation in the title.

The paradox is nice - at the root level of many issues, there lies something with a paradoxical nature.

Didn't see anybody mention "miller" yet ... pipe/grep/cut/awk etc for CSV files, really rocks.