List of free CSS stuff for developerππ½
If you're looking for all programming tools around CSS (not just free). Check this page List of CSS Programming Tools

CSS-Tricks
Daily articles about CSS, HTML, JavaScript, and all things related to web design and development..
Tag: css, learning-resource

100Devs - leonnoel.com
Train people underrepresented in tech for high growth careers as software engineers.
Tag: HTML, CSS, JavaScript, learning-resource
Free course to learn (or refresh your knowledge of) full-stack development.

Stisla
Stisla is a free Bootstrap admin template. Stisla will help you to speed up your project, design your own dashboard UI and the users will love it.
Tag: bootstrap, html, css, template
Stisla is no longer a simple version and a pro version. Now, everything is the same. The many components and full features, speed up your project.
Free Tailwind CSS Components

Headless UI
Completely unstyled, fully accessible UI components, designed to integrate beautifully with Tailwind CSS
Tag: CSS, Tailwind, ui-component, CSS-for-react
A set of completely unstyled, fully accessible UI components, designed to integrate beautifully with Tailwind CSS.

Web Code Tools
The ultimate web code generators. Generate HTML, CSS, JSON-LD, Twitter Cards, Open Graph and more! No coding skills required.
Tag: html, css, JSON, meta