Moszen - Moszen is a free web service that provides ambient sounds from natural environments to help you relax and avoid stress in your daily life.
Padlet - Visual boards for organizing anything.
Noizio - Feeling that the noise of the big city is too much for you to bear?
BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.
Sleep Bug - Sleep Bug is the name of an ambient sound mixer that generates a wide range of scenes and music using the random sound effects.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.