Between the high-quality videos and the extensive collection of lesson plans, TED-Ed is a great resource for students and teachers looking for inspiration, education, and maybe even some fun.

BrainPOP is very great overall. It has lots of great videos for kids to watch. There are also activities after the videos like the quiz and related reading. I like how there is also BrainPOP Espanol, which lets Spanish kids and people who want to learn Spanish also learn things.