Educational Technology
Math
Khan Academy
Mathplayground
Sheppard Software
Fuel the Brain
Math-Play
Mr Nussbaum
ABCya
National Library of Virtual Manipulatives
Language Arts
Newsela
Starfall
PBS Kids Writer's Contest
TypingClub
Science / Social Studies
Brain Pop (free stuff section)
Crash Course (YouTube videos by John and Hank Green)
Other
Quizlet
Code.org
Code Academy
MIT's Scratch