Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

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.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Padlet - Visual boards for organizing anything.

Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.

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