SchoolTube is a great resource to both find and post educational videos. It is basically YouTube for educators and students. Whether you are looking for a video to use in a lesson or you just want to share videos that students have made, SchoolTube is the resource for you.

Glogster is an awesome resource for both teachers and students. Teachers can use it to create interactive lessons and glogs that display graphics and statistics. Its useful for students to create online posters as well as presentations. It provides lots of resources to make these glogs very interactive.
https://edu.glogster.com/