Stole this link from @InsideTeaching MSU. Thanks, folks–these are worth passing on!
Their suggestions include WordPress, DropBox, EverNote, Khan Academy, TED Ed and more. You may use some of these already (I sure do), but some of them may be new to you. Let us know in the comments which ones are most useful for you as you prepare your teaching. Or just for organizing your life.
Some of the best teachers and schools in the country are providing free material online. Use these sites to supplement your own lessons, to help students prepare for tests, and to let accelerated students branch out. If you’d rather be in charge of the content your students see, you can easily create your own online lessons.