https://www.geogebra.org/calculator
https://gchq.github.io/CyberChef/
https://bluecinema.ch (To buy movie tickets for a certain movie chain in Switzerland. I haven't used this in many years, but at first glance it looks like I remember it. Back then, this was a very smooth experience both on desktop and mobile. Just perfectly done.)
Any spreadsheet program (it's the spreadsheet itself, which I like, not necessarily how the UI is aranged around it)
Apple's Spotlight, GNOME's similiar thing (don't know the name)
I also like Tantacrul's interface design work: https://www.youtube.com/@Tantacrul/videos
Netflix? The barely functional video player accessed via excessively bloated thumbnail gallery? About the only good thing to say about this is that all the other movie streaming platforms somehow are even worse.
Fundamentally it's a bikeshed effect. Complaining about hard features like performance is likely to get you in trouble if you aren't actually doing the leg work to measure it and/or expert enough to shout down the people who show up to argue. But UI paradigms are inherently squishy and subjective, so you get to grouse without consequences.
For example, you couldn't pay me to use a "webmail" like GMail over my own IMAP server and Thunderbird.
/s but I wish it wasn’t because a lot of FOSS evangelists have this mindset (here on HN too)
(Taken holistically, the UX of software does not just mean the UI, or the moments when you are using the software. It also includes the stability of the software over time, including whether or not you are able to reject new versions whether you do not like.)
I do it for autonomy and avoiding lock-in, but Thunderbird has some frustrating inconsistencies particularly in its mishmash of searching and filtering.
I don’t the the web is compatible with good UX, but that doesn’t mean good UX isn’t possible — it just means that the companies that are successful at UX build native applications, or physical objects, or both.
Things for macOS for example.