What popular sites are offline (work without an internet connection)?

Question

JavaScript

I remember when Google calendar seemed to have this, though I don’t use it anymore.

Answer 1

devdocs.io

Answer 2

Now it makes no sense for large companies to bother and do something autonomous ... There are applications for autonomy.

Answer 3

various cards)

Answer 4

I can’t say for popularity, but app.nirvanahq.com can work offline after the first visit to it (and even if the tab is closed and opened, as long as it clears up when it opens).