Fonts used by this site, all under the SIL Open Font License 1.1 (licence texts beside this file).

WashedSerif-*.ttf    static cuts of Source Serif 4 (OFL-SourceSerif4.txt), renamed as the OFL requires for modified fonts
WashedDisplay-*.ttf  static cuts of Inter Tight (OFL-InterTight.txt)
WashedText-*.ttf     static cuts of Inter (OFL-Inter.txt)
IBMPlexMono-*.ttf    IBM Plex Mono, unmodified (OFL-IBMPlexMono.txt)

Source and hashes: custom-silicon-book/studio/print/themes/washed-guide/README.md.