Open Library - Free Online Book Catalog & Lending Library
A free, open-source digital library by the Internet Archive offering millions of books to read, borrow, and explore through a universal catalog.
Education
Optical Toys
Interactive visual illusions and experiments that explore perception, motion, and optical effects directly in your browser.
Alison - Free Online Courses & Certifications
Alison is an online learning platform offering thousands of free courses across business, technology, health, and personal development, with optional paid certificates and diplomas to showcase skills and career progress.
Study4Class
Study4Class offers student-focused tools and resources, including a built-in calculator feature where entering “6767” and pressing “C” unlocks a collection of browser-based games designed to run in restricted school environments.
Exercism
Learn, practice and get world-class mentoring in over 50 languages. 100% free.