The NCTM website is one everyone is familiar with; there are a lot of resources here that are great for explaining concepts. This is an interactive activity working with vectors to help students understand basic facts about the difference between magnitude and direction.
I love this site and want to incorporate it into my classroom. It's a great way to keep track of all the books you read, challenge yourself to read a certain number of books in a year, and see what your friends are reading.
This is a great math site. It includes sections for activities, lessons, standards, and web links. The activities and lessons are grouped into grade levels to facilitate your search.
When used educationally, podcasts can empower students and teachers to become content producers rather than content consumers, and they can give them audiences beyond the classroom. Student-created podcasts reinforce course concepts, develop writing skills, hone speaking ability, and even help parents stay current on classroom activities.
The History Engine is a web-based educational tool hosted by University of Richmond. Students use this site to learn history by researching, writing, and publishing specific episodes of American life. The online, searchable database contains works of students from all over the country. Excellent site for teachers, students and anyone interested in history.
Such a fun tool! It's a free and diverse visual drawing piece. If I were using this in the classroom, I might do it to create graphic organizers, which would be highly helpful! It also allows you to upload images, text and documents and mark them up with simple "paint" type tools. Very useful!
This is one of my favorite ways to keep my "desktop" online organized. I can create quick links to any web-pages I access on a regular basis through symbaloo, and also customize it to look how I want! I like keeping my frequently accessed tools (youtube, wordreference, edmodo) in pink and then sites I still would like to check out in black. This is really useful!