Diigo - collect and share bookmarks/favorites, notes, screenshots and highlighting.
Delicious - save and share bookmarks/favorites online.
Edmodo - secure online environment where teachers and students can collaborate, share content, and use educational apps.
FreeRice.com - Interactive review game. Correct answers earn rice for UN World Food Program. Subjects include art, chemistry, English, geography, world languages and math.
Google Drive - allows users to create, store and share documents, slideshows and spreadsheets. Student accounts are available to provide students with access to use this service. Files can be shared to allow small groups of students to edit the same file. Student email addresses are available for school use.
Google Tools - you already know about using Google to search. Did you know that Google also provides dozens of other free tools that can be useful to teachers, students and parents?
Google Search Tips & Tricks - use Google to quickly find a weather forecast, convert English and metric units, sport scores, movies, flights, definitions and more.
Khan Academy - Over 2,000 free, educational videos. Most of the videos are for secondary math and science. The Developmental Math section includes basic math concepts such as place value, rounding, fractions, multiplication, and division. These videos may be useful for regular instruction, enrichment, remediation or homework help for students and parents.
NBC Learn - thousands of historic videos, current events, and original resources for K-12 teachers and students. Login to blendedschools.net to access the complete collection of resources.
SchoolTube - educational videos posted by teachers and students. Videos can be viewed without a login but a login is required to upload and post videos.
StoryBird - provides art work and illustrations to write online stories.
Sumo Paint - online image editor and paint program.
Tagxedo - turn words -- famous speeches, news articles, slogans and themes, -- into a visually stunning tag cloud, words individually sized appropriately to highlight the frequencies of occurrence within the body of text.
TeacherTube - educational videos posted by teachers and students. Videos can be viewed without a login but a login is required to upload and post videos.
TED - Ideas worth spreading. Educational and inspirational videos.