A Libre Font List.

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When people see type that they feel could be improved, if it is in the public domain they are free to do so. With the development of free software font editors, everyone has access to the necessary tools. Now the obstacle is that the knowledge of how to develop and refine type is not freely available.
— David Crossland

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End result of a thread on twitter: https://twitter.com/imagineterrain/status/1017789533390286849

And, outcomes of explorations and thinking from a course I ran in Spring of 2018 — Special Topics in Graphic Design: Open Source at the Maryland Institute College of Art.

My personal favs when it comes to F/LOS type offerings

• Amstelvar
  • https://github.com/TypeNetwork/Amstelvar
  • https://www.typenetwork.com/brochure/opentype-variable-fonts-moving-right-along/
• Barlow: https://tribby.com/fonts/barlow/
• Cormorant Garamond
  • https://www.behance.net/gallery/28579883/Cormorant-an-open-source-display-font-family
• Fira (extensive family from Mozille & others)
  • https://bboxtype.com/typefaces/FiraSans/#!layout=specimen
  • http://mozilla.github.io/Fira/
  • https://github.com/mozilla/Fira
• Garamond No. 8 - https://garamond.org/
• Gentium: https://software.sil.org/gentium/download/
• GNU Grotesk: https://github.com/eliheuer/gnugrotesk
• Inria
  • https://github.com/BlackFoundry/InriaFonts
  • https://black-foundry.com/work/inria/
• Plex (extensive family from IBM): https://www.ibm.com/plex/
• League Gothic: https://www.theleagueofmoveabletype.com/league-gothic
• League Mono: https://www.theleagueofmoveabletype.com/league-mono
• Liberation Fonts (RedHat): https://pagure.io/liberation-fonts (metrically compatible replacements for arial, times new roman, and courier new)
• Libre Franklin
  • https://github.com/impallari/Libre-Franklin
• Libre Baskerville
  • original: https://github.com/impallari/Libre-Baskerville (on google fonts: https://fonts.google.com/specimen/Libre+Baskerville)
  • ITF additional weights: https://github.com/itfoundry/LibreBaskerville
• Libre Bodoni: https://github.com/impallari/Libre-Bodoni
• Libre Caslon: https://github.com/impallari/Libre-Caslon-Text & https://github.com/impallari/Libre-Caslon-Display
• Libre Clarendon: https://github.com/impallari/Libre-Clarendon
• Not Courier Sans (Open Source Publishing)
  • http://ospublish.constantvzw.org/foundry/notcouriersans/
• Noto (Google): https://www.google.com/get/noto/
• Open Sans (Google)
  • https://github.com/googlefonts/opensans
  • https://fonts.google.com/specimen/Open+Sans
• Overpass (Redhat): http://overpassfont.org/
• Poppins (ITF)
  • fonts: https://github.com/itfoundry/Poppins/blob/master/products/PoppinsLatin-5.001-Latin-OTF.zip
  • sourcecode repo: https://github.com/itfoundry/Poppins
• Source Sans/Code/Serif (extensive family from Adobe)
  • https://adobe-fonts.github.io/source-sans-pro/
  • https://github.com/adobe-fonts/source-sans-pro
  • https://typekit.com/fonts/source-sans
  • https://typekit.com/fonts/source-code-pro
  • https://typekit.com/fonts/source-serif
  • https://typekit.com/lists/source-han-sans
  • https://fonts.google.com/?query=source
• Spectral: https://github.com/productiontype/spectral

A more general listing of any and all interesting finds I've come across can be found on Are.na:
https://www.are.na/kristian-bjornard/libretype

And, look at, test, download, etc. at:

• http://design-research.be/by-womxn/
• https://fontain.org/
• https://fonts.google.com/ / https://github.com/googlefonts
• http://usemodify.com/
• http://typotheque.interstices.io/