EDSITEMent! (lessons and student activities)
Edutopia (Online resources for primary sources)
PBS Learning Media (standards-aligned educational videos and resources K-12)
Hip Hughes History Videos (YouTube Videos that cover Grades 6-12 content)
Crash Course World & US History (YouTube Videos that cover Grades 6-12 content)
Smithsonian Education Learning Lab (digital resources from Smithsonian institutions)