Here is a list of free educational resources found online, categorized by subject and age group:

For all ages:

• Khan Academy: Offers free, personalized practice in math, science, computer programming, history, art, economics, and more.

• Duolingo: Learn a new language for free with Duolingo's interactive lessons and gamified approach.

• National Geographic Kids: Explore the world and learn about animals, science, history, and more with National Geographic Kids' website and app.

• Codecademy: Learn to code for free with Codecademy's interactive lessons and projects.

• TED-Ed: Watch educational animated videos on a variety of topics, from science and history to literature and philosophy.

For kids:

• PBS Kids: Watch educational shows, play games, and learn about science, math, reading, and more with PBS Kids.

• Nick Jr.: Play games, watch educational videos, and learn about math, science, reading, and more with Nick Jr.

• Storyline Online: Listen to celebrities read aloud popular children's books.

• Sesame Street: Learn about letters, numbers, colors, and more with Sesame Street's website and app.

• Starfall: Learn to read with Starfall's interactive phonics lessons and games.

For teens:

• Crash Course: Watch engaging and informative video lessons on a variety of subjects, from history and science to literature and philosophy.

• MIT OpenCourseware: Access free course materials from MIT, including video lectures, readings, and assignments.

• Open Culture: Find free online courses, ebooks, audiobooks, and more.

• Academy of Khan: Learn about finance, entrepreneurship, and economics with the Academy of Khan's free video lessons and resources.

• edX: Take free online courses from top universities around the world, including Harvard, MIT, and Berkeley.

For adults:

• Coursera: Take free online courses from top universities and companies on a variety of topics.

• Udemy: Find free and paid online courses on a variety of topics, from coding and marketing to photography and personal development.

• British Council: Find free online courses on how to teach English.

I hope this list is helpful!

If you know of other websites offering free resources, please share below.