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An annual collection of language-independent programming puzzles

Frontend interview questions across code, CSS and design

Illustrated programming lessons with browser coding practice

Swift explanations grounded in language and app-development examples

A practical R workflow for transforming and visualizing data

Build computing systems from logic to software

Learn computer architecture through logic and assembly puzzles

Taxonomic lookup for plants, animals, fungi and microbes

A maintained catalogue of marine taxonomic names

Biographical lookup with period and occupation filters

Search and inspect three-dimensional molecular structures

Primary sources on the history of science

Interactive Icelandic built around life in Iceland.

Hands-on study of computing and cybersecurity foundations

Structured lifelong learning for the health workforce

Coordinates class schedules and enrollment for music schools.

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

Official specifications and free preparation resources for UAT-UK admissions tests.

Interactive maths tools, courses and manipulatives, including a route to Polypad.

European Portuguese courses, stories and audio.

Sanskrit explanations from first principles to traditional grammar.

Adaptive vocabulary study with custom topic decks.

Study languages through shows, films and music.

Free language study for real-life situations.