Font Resources
Using open source fonts in your design projects can allow you much more freedom over what you create and how you can distribute. Open source font licenses typically allow you to use, modify and distribute fonts freely. This can be massively helpful in usage on the web, where modifying your fonts to be smaller provides many benefits. Below are some lists of fonts, as well as some recommended tools for use modifying fonts.
Font Foundaries
Groups creating free, open source fonts.
Font Collections
Collections of open source fonts. Some feature fonts exclusively made by Womxn or non-binary/post-binary folk. Use & Modify is my highest recommendation for any designer out there, a beautiful curation of open source fonts by Raphaël Bastide.
A note on using Google Fonts
My list doesn't include Google Fonts because I no longer recommend using the site for obtaining fonts. All fonts featured and available there are open-source, however I don't believe Google's motivations are in good faith. The most prevalent way to use Google Fonts involves directly linking your site to Google's font api so you don't need to download or load fonts from a file. If you do this, your site is instantly hosting google tracking and analytics, so much to the point that people have been prosecuted for not making users aware of this (it's likely the prosecuted people weren't even aware themselves). So instead of using Google Fonts, I implore people to consider checking out and supporting the Font Foundaries themselves, whose fonts populate Google Fonts.
Font Tools
Modify and preparing fonts can be essential part of a project. Many tools target web usecases, where decreasing the size of a font can reduce load times massively. While these tools tend to be fairly hands off, some tools like FontForge can be used in situations where more fine-tuned modifications is required. Glyphhanger is a highly recommended tool, allowing you to automatically crawl your website and create perfectly sub-setted fonts based on the content.
Misc. Font-related Resources
Fonts in Use is a great aesthetic resource for inspiration using fonts.
