For those of you who may have missed a Catch of the Day or who didn't have the opportunity to look at some of them during this past week, here's a second chance.
The mission of soon-to-be-launched TED-Ed is to "capture and amplify the voices of great educators around the world."
LearnZillion provides easy access to quality video math lessons, assessment items, and progress reporting. Get practical teaching resources, create playlists for your class, track homework, and deliver lessons to your students in a timely manner.
Smithsonian's History Explorer is a full-featured search tool for all the educational resources from the National Museum of American History. History Explorer was developed by the museum to offer K-12 teachers and students hundreds of free, innovative online resources for teaching and learning American history.
Shelfster is a free tool designed to collect resources and place them all at your fingertips when creating a document. Your ideas and sources of inspiration are gathered together in one place, no longer lost or scattered in different locations.