Khan Academy is a non-profit educational organization that offers free online resources, including instructional videos, practice exercises, and educational materials, covering a wide range of subjects such as math, science, economics, humanities, computer programming, and more. It was founded by educator Salman Khan in 2008 with the mission of providing a free, world-class education for anyone, anywhere.

Highlights features a variety of activities, stories, puzzles, and articles designed to engage young readers and encourage learning in a fun and interactive way. The magazine often includes stories about everyday life, science, nature, history, and culture, as well as puzzles, hidden picture games, and crafts.

National Geographic Kids features colorful photographs, articles, quizzes, and activities designed to spark curiosity and inspire learning in children ages 6 to 14. The magazine covers a wide range of topics including animals, geography, history, environmental conservation, and exploration.

The Study Island website provides interactive learning activities, practice exercises, and assessments aligned with state standards and Common Core standards. It offers a personalized learning experience where students can work at their own pace and receive immediate feedback on their progress.