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Contest problems with automatic solution judging

Ethereum development through practical coding challenges

Learn Ruby by correcting ordered test-based exercises

Study software design by rebuilding familiar tools in Python

A written introduction to JavaScript and browser-console work

A systems textbook with interactive learning resources

Chemical reference data with documented data collections

An interactive periodic table with property and isotope views

Fish reference lookup by common or scientific name

Open textbooks and educational materials across disciplines

Human-protein information across tissues and biological contexts

Search the Medical Subject Headings vocabulary

Historical maps with text search and geographic viewing tools

Open online courses from Spain's UNED.

Turn training videos into interactive assessments with AI questions, pass rules and certificates.

Hands-on study of computing and cybersecurity foundations

Lung-health education alongside tobacco, clean-air and community resources

Structured lifelong learning for the health workforce

Text to speech online with natural voices and MP3 downloads.

Self-paced training for Google's advertising and measurement tools.

Medical learning and preparation routes for USMLE, COMLEX, PA and rotation exams.

Phonics games grouped into phases, with explanations of sounds, blending and spelling development.

A public library of children's science, engineering and creative projects, searchable by age and materials.

Children's science experiments, printable resources, fair ideas and STEM challenges.