Interactive Sites for Education: Website with a large database of educational games based on specific learning categories for grades K-5

Turtle Diary Games geared toward a variety of subjects for every grade level.

Arcademic Skill Builders: Site has free and paid content. I like that students play with other students and can earn a spot on the "leaderboard" by earning a high score. Each game has which Common Core Standard it addresses below it.

National Geographic Games Students can play games to learn about maps, habitats around the world, famous people, and historical events.

Free Rice Every question answered correctly earns free rice for a poor nations.

San Diego Zoo

Rainforest Alliance