Open source
The A11Y Project
Community guide to making websites accessible
Design A11y PerfCommunity accessibility guide
12 tools like Web Almanac, chosen by what they do. About Web Almanac

Community guide to making websites accessible

Guides on CSS layout that let the browser do the work

Online UX, UI and AI design courses with certificates

UX research, training courses and guidance for design teams

Filterable guide to WCAG 2.2 success criteria and techniques

Design tactics for developers who want to improve their UI

Free online book that teaches Git, from basics to branching

Long-form articles on web design and development

Official free book that teaches the Rust programming language

Community-curated list of free programming books and resources

Open guide to large-scale system design and interview prep