Greatschool.org: Hundreds of free printable material for kids of all ages.
Scholastic: Explore free printables for all ages that cover subjects like reading, writing, math and science.
Find Hidden Object Puzzles: All things hidden pictures.
krazydad: Free printable mazes for all ages and abilities.
Printable Mazes: From easy to hard, 480 mazes in this collection.
Education.com: Free printable worksheets for kids. From math to science and everything in between. All worksheets were created by professional educators.
Highlights Work Sheet Library: Enjoy 36 feature pages from the popular children's magazine including, hidden picture puzzle, rebus stories, and crafts.
Every Child a Reader: Book art from 23 children's book illustrators all with the theme, Read. Dream. Share.
Crayola: Loads of free coloring pages.
DLTK: Hundreds of coloring pages on various topics.
Just Color: Loads of coloring pages for adults on various themes, difficulty levels and styles.
coloring4kids.com: Updates daily.
Best Coloring Pages for Kids: Animals, cartoon characters, cars and more. Thousands of printables all in one place.
Just Color Kids: Organized by theme, also educational pages to print.
Art is fun: Free coloring pages geared toward adults but enjoyed by all.
Monday Mandala: Loads of beautiful mandalas to print and color.