Dialpad - Switch is a cloud-based phone system built for Google Apps users.
SimpleTexting - SimpleTexting offers SMS and text marketing services for companies of all sizes.
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.
SlickText - Slick Text provides businesses and organizations with an easy and affordable platform for text message marketing.
3CX - Hosted PBX with CRM integration and mobile apps
Textmagic - The all-in-one solution for all your business texting needs - marketing campaigns, two-way SMS chats, reminders, notifications, and internal staff communication.