Tatango - Tatango is a mobile messaging platform for agencies.
Postscript - Like Mailchimp for SMS
Flowroute - Flowroute provides direct access to telephony resources - such as calling, messaging (SMS & MMS), call routing, SIP Trunking and Communication APIs.
SalesNexus - Online CRM software, email marketing, and lead generation solution. The best crm sales software for business - SalesNexus
ClickSend - ClickSend builds communication software and tools for businesses. We offer SMS, MMS, Voice, Email, Online Mail and even Fax. All accessed via our Dashboard, app, flexible API or integrations.
Heymarket - The professional way to text message. Your customers are mobile. Heymarket helps you manage those relationships from your smartphone.