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.

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
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.