Flowroute - Flowroute provides direct access to telephony resources - such as calling, messaging (SMS & MMS), call routing, SIP Trunking and Communication APIs.

rivalry - Your competitors websites are full of data that reveals useful information about them. Rivaly helps you collect this data and analyze it so you always can be one step ahead

Tatango - Tatango is a mobile messaging platform for agencies.

Belkins Data Enrich - Find email addresses in seconds

Postscript - Like Mailchimp for SMS

Fonoster - A marketplace where local telecom companies can publish numbers, developers can build voice, video, and chat solutions.