ABCmouse.com is a comprehensive early learning site for children ages 2 through 6+, covering reading and language arts, math, science, social studies, art, and music. It is completely child-safe, with no advertising or links to other websites.
Links
[1] https://www.relib.net/db-abcmouse.com
[2] https://www.relib.net/for-students
[3] https://www.relib.net/education
[4] https://www.abcmouse.com