IBM Plex is very good. Recently, I have been enjoying https://rsms.me/inter/ for interfaces a bit more (with ss02 for body and ss02+tnum for tables activated).
Inter is the only libre typeface that has good coverage, and produces readable small text on terrible 80 DPI displays. I've tested probably hundreds of them.
I guess I can try to argue that it if it weren't as generally useful as Helvetica it wouldn't have been made the default in Figma and it wouldn't be, well, so generally used.
Hah, this one can go on Wikipedia as an example for "chicken or the egg"! IMO, there's probably a number of other fonts that could've been chosen rather than Inter as default Figma font, and if they had been, they'd now be more ubiquitous than Inter. Of course, we'll never know. Unless someone here is looking to do a research study into popularity of fonts over time compared to popularity of Figma and seeing how strong the correlation is - maybe a weekend project for someone into typography ;)
Ah, it initially appeared that the capital I and the lowercase L have identical-looking glyphs. But scrolling down, I see the ss02 and tnum features add noticeable glyphs. Looks like a nice typeface.
