GitHub Gist - Gist is a simple way to share snippets and pastes with others.
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.
SnippetsLab - SnippetsLab is an easy-to-use snippets manager.
Padlet - Visual boards for organizing anything.
massCode - A free and open source code snippets manager for developers.
Socrative - Socrative helps teachers engage the class with educational activities to measure and visualize...