Avochato - Text messaging for your business.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Postscript - Like Mailchimp for SMS
Crowded Communities - The all-in-one community platform.
GetChat.App - Add WhatsApp chat to your website for free
Ning - Ning is the social platform for the worlds interests and passions online.