Windows event viewer… You open it, go to the toilet, to the shower, take a coffee, … and only 2 more minutes later, it shows you the entries…

It’s so perfect, they never had to improve it in decades.

/s

I would say git, tex, sqlite, Clojure, Steel banks common lisp are some of the candidates.

Perfect doesn’t meen “not any bugs fixes or features needed” to me. I can’t really define what it means to me…

TeX?

Development is considered to be complete, and the version numbering is just adding a digit of pi. Last change was 5 years ago.

For software to be perfect, can not be improved no matter what, you’d have to define a very specific and narrow scope and evaluate against that.

Environments change, text and data encoding and content changes, forms and protocol of input and output changes, opportunities and wishes to integrate or extend change.

pwd seems simple enough. cd I would already say no, with opportunities to remember folders, support globbing, fuzzy matching, history, virtual filesystems. Many of those depend on the environment you’re in. Typically, shells handle globbing. There’s alternative cd tools that do fuzzy matching and history, and virtual filesystems are usually abstracted away. But things change. And I would certainly like an interactive and fuzzy cd.

Now, if you define it’s scope, you can say: “All that other stuff is out of scope. It’s perfect within it’s defined target scope.” But I don’t know if that’s what you’re looking for? It certainly doesn’t mean it can’t be improved no matter what.

Htop

emacs can only be improved no matter what but it should count

I wanted to say VLC because to me, it’s the gold standard of fully working open-source software that just destroys the commercial competitors.

But it’s not perfect only because society changes. New video formats forces VLC and open-source devs to adapt. Bigger video and new tech specs require VLC to update. If it wasn’t for all those external needs, VLC would be perfect.

Did I also mentioned the many times rich companies wanted to buy VLC and they laughed?

Idk if it’s perfect but I really like the “literate programming” version of `

This is not the original, but here is one version of it : https://github.com/zyedidia/Literate/blob/master/examples/wc.lit

Does IRC count ?

A program that just prints “Hello World” to the screen and quits.

mcmaster.com is pretty close…

Winamp! It probably had some bugs or security issues but functional it was perfect imo.

Logic gates?

wget.

TeX. Best documented source, and last bug found was 12 years ago.