fruux - Free service that takes care of your contacts, calendars and more so you don't have to.

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.

FullContact - Put the power of full contact information into your web or mobile apps.

Padlet - Visual boards for organizing anything.

Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.

Socrative - Socrative helps teachers engage the class with educational activities to measure and visualize...