Educational Video playlist on YouTube 

Language Arts:
NaNoWriMo - National Novel Writing Month

Geography:
Mercator Puzzle

Math: 
Khan Academy
That Quiz
Math Games- Sheppard Software
Vi Hart - interesting math projects 
IXL
Simpsons' Secret Formula

Science:
NASA
California Academy of Sciences
Phet - Interactive Simulations
Next Generation Science Standards
AsapSCIENCE
VSauce
SciSchow
CK-12
Sencer - science education for new civic engagements and responsibilities 

Music: 
Rebel Music - get the Native America lesson plan here
Sonic Pi live and coding
Figure - iPhone App

All Subjects:
Brain Pop
PBS Idea Channel
12 Riddles