Modern Fonts

Noto Serif/Sans CJK & Source Han Serif/Sans

https://github.com/notofonts/noto-cjk https://github.com/adobe-fonts/source-han-serif https://github.com/adobe-fonts/source-han-sans
Download guide by Adobe https://github.com/adobe-fonts/source-han-serif/raw/release/download-guide-source-han.pdf
Differences between Google-branded and Adobe-branded versions https://github.com/adobe-fonts/source-han-serif/blob/release/SourceHanSerifReadMe.pdf https://github.com/adobe-fonts/source-han-sans/blob/release/SourceHanSansReadMe.pdf told in CTeX-org/ctex-kit#686 (comment)

Alegreya Family

Design: Intended for literature
Family: Serif, Sans, Small Caps, Sans Small Caps
License: Open Font License
Source: Google Font | Huerta Tipográfica | GitHub
LaTeX support: alegreya package

Variable Fonts

Recursive

Homepage: https://www.recursive.design/
Source Repo: https://github.com/arrowtype/recursive/
License: SIL Open Font License 1.1
Axes: Monospace, Casual, Weight, Slant, and Cursive