One page reference chart of open source fonts that are size-compatible with well known standard commercial fonts.
There are, of course, a large variety of style open source fonts as well, for all manner of uses. But for basic documents, consider using Nimbus Sans or TeX Gyre Termes instead of your system default.
This blog is (currently, November 2020) in Noto Serif, from the worthy Noto project trying to cover the entirety of Unicode.