Science
PHet Simulations - interactive simulations
Images of Change - compare images at different times
Kids Discover - free resources and lesson plans
Interactive Sites for Education - Science
Dynamic Periodic Table
PORTS - CA Department of Parks and Recreation - science
Scholastic Study Jams - science videos and quizzes
Museum of Science & Industry - games, apps, videos, activities, and podcasts
Science Buddies - hands on science resources
Exploratorium - online resources
ASU School of Life Science
Edheads - online games and activities
CK-12 - science simulations
Science Kids - games, experiments, facts, quizzes, projects, lessons, videos, and more
Digital Explorer - resources, programs, and live events
Jefferson Lab - student and teacher resources
Cast Science Writer - resource for lab reports
NASA Kids' Club- teacher and student resources 

Social Studies
Kids Discover - free resources and lesson plans
Interactive Sites for Education - Social Studies
PORTS - CA Department of Parks and Recreation - social studies
Maps of War - current events contacted with historical information with the use of maps
Library of Congress - lesson plans and teaching materials
The National Archives Museum - Home Page
National Archives (Digital Vaults) - primary source documents
National Archives (Docs Teach) - tools and resources to teach with primary source documents
Historical Scene Investigation - online investigations that bring history to life
World Digital Library - primary source documents
Dipity - create a timeline
GeoGuessr - explore the world by using observation skills to discover where you are at on a map.
PBS - teaching resource
The National Museum of American History - teaching resource
History.Com - teaching resource