Local

Linux

non-HiDPI

Used on ThinkPad T530, Shimian 2560x1440s.

In /etc/lightdm/lightdm.conf, under [SeatDefaults]: add "-dpi 86" after xserver-command.

Firefox

layout.css.devPixelsPerPx setting:

• for 120 dpi: 1.45

Around the web/elsewhere

Serif fonts

• Bitter used on http://elixir-lang.org/

• Enriqueta used on http://benlog.com

• PTSerif used on Quartz

• Merriweather

• Fjord One. Used on CherryPy.org and breadbox64.com.

Sans-serif

• FrieghtSans Pro on http://nautil.us/

• Lato 11px in Visual Vertex Muster 8 "Flat Dark" theme

• Calibre used by Simple

• Aktiv Grotesk used on http://www.minimallyminimal.com/

• Fauna One. Good for headings.

• TeX's Computer Modern aka CMU Sans Serif. WebFonts. TTF, OpenType. Used by http://omershapira.com/

• Latin Modern. Webfonts.

Monospaced

• Iosevka: Both serif and sans-serif variations

• Nanum Gothic Coding (at Google Fonts), used on cpu.fail.

Other

• Rubbish: Font based on letters on trash cans

Configuration changes

• ttf-droid font package is deprecated; find latest version and put into fonts repository.
• "Droid Sans Mono" no longer distributed with ttf-droid; find latest version and put into fonts repository. Change fontconfig configuration to include "Noto Mono" which is modern replacement for "Droid Sans Mono".

OpenType variable fonts

gallery of variable fonts: https://v-fonts.com

• rsms/inter: sans-serif

• sudo: monospaced

• source-sans-pro and source-serif-pro: variable versions of Adobe Source Sans pro and Source Serif Pro

• iA writer fonts, modification of IBM's Plex font

• titillium web variable: variable version of Titillium Web

Proprietary stuff:

• San Francisco (macOS system font) has a variable version

• Marvin Visions

• ETC Grandstander

Printed/Typeset documents

• Palatino Light, Palatino Pro Light: Serif font used by sfplanning.org notice.