The right font can dramatically improve your website or application.
I have compiled a list of open-source fonts that will compete with popular fonts such as DIN, Proxima, Helvetica and might even convince you to ditch them. All fonts listed here are fully open-source glyph files, which means they can be used for free in both personal and commercial projects.
Libre Baskerville
https://github.com/impallari/Libre-Baskerville
Titillium
https://fonts.google.com/specimen/Titillium+Web
Space Grotesk
https://github.com/floriankarsten/space-grotesk
Public Sans
https://github.com/uswds/public-sans
Inter
https://fonts.google.com/specimen/Inter
Overpass
https://github.com/RedHatOfficial/Overpass
Urbanist
https://github.com/coreyhu/Urbanist
IBM Plex
https://fonts.google.com/featured/Plex
Thanks for the help in this question.