Avochato - Text messaging for your business.
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Postscript - Like Mailchimp for SMS
Kindful - Nonprofit donor database + fundraising tools all in one
GetChat.App - Add WhatsApp chat to your website for free
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps