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Learney - Knowledge aggregator for developers
Call2friends - High-quality cheap and free international calls online to any mobile or landline numbers from internet and free calling app - cheaper than other VoiP providers. Try it now!
Multiplication Kingdom - Learn the times tables by playing and having fun in the Multiplication Kingdom (for kids and adults!)
Make Free Calls Online - Make Free Calls Online is a web application that, as the name suggests, allows its users to make international and local calls for free.
Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
Poptox - Poptox is a web application where you can communicate with people in every corner of the world.