Twilio - Brings voice and messaging to your web and mobile applications.
Yotpo - Yotpo is the smartest way to generate customer content, drive traffic and increase conversions.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Swagbucks - Swagbucks is a loyalty program that offers individuals rewards for engaging in various activities. Users can earn reward points for performing Internet searches, purchasing items from affiliated vendors, or completing polls.
Clockwork SMS - Clockwork is an Easy Text Message API. An SMS API for Developers. Build powerful apps and include SMS. Signup is free, Try it now.
Five Stars - Discover millions of rewards from thousands of local businesses.