AtCoder
atcoder.jpProgramming contests with a permanent practice entry point
Programming contests with a permanent practice entry point
A language-course library with personal and institutional access routes.
Coding paths with backend, DevOps and data projects
Interactive coding lessons leading into projects
Coding exercises for data and machine-learning study
Learn CSS selectors by choosing items on a table
A browser simulation for exploring Git repositories
Free learning games for elementary maths, reading, spelling, typing and problem solving.
IT exam learning resources including books, video, flashcards, simulations and practice tests.
Fraction and percentage practice with exercises, a learning mode and answer feedback.
Digital learning cards with automatic marking, classroom play options and progress reporting.
Physiotherapy masterclasses, research reviews and practice tools.
Personalized French and Spanish study with progress reports.
Role-based training on HubSpot and wider business skills.
Native landscape education with local chapters and garden designs
Arabic script, everyday skills and dialect learning.
Cryptography learning through interactive puzzles and challenges
Smart-contract development and security learning tracks
Animated lessons and connected activities for school science, social studies and other subjects.
A school learning platform combining curriculum media, prepared lessons and teacher guidance across subjects.
Curriculum learning through hip-hop videos, related activities and student creation tools.
Maths worksheets and learning resources organised by topic and school grade.