Cryptee is one that comes to mind.

Here’s a list of Non-Open Source web apps: https://www.neoito.com/blog/best-progressive-web-apps/

Here’s a list of Open Source web apps: https://en.m.wikipedia.org/wiki/List_of_free_and_open-source_web_applications

The barrier of entry for these apps are just so low. You don’t have to download anything for them to work and (for now) they’re crossplatform.

If you haven’t yet, you might want to try voyager on your lemmy instance: https://vger.app/

Popular? None.

But we don’t only have to build an environment that allows the doing of popular things. We also need to maintain a society in which unpopular or unusual things can be done. The doing of unpopular or unusual things is itself popular.

my own reddit viewer https://rdx.overdevs.com

If I’m understanding right, I believe Xbox Cloud Gaming and Geforce Now have used this. They get access to better video APIs by running as a home screen webapp, and aren’t at risk of popping the address bar from touch confusion.

Voyager, a client for Lemmy, also installs as a webapp. Similarly, it doesn’t show the address bar when you scroll up and down.