Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Mobilize - Mobilize is a scalable messaging app built for large groups.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Facebook Messenger - Facebook Messenger is a faster way to message.
FUEL CYCLE by Passenger - Think Passenger builds online platforms that allow brands to connect, create and communicate with key stakeholders.