Sinch is a VoIP system that makes it easy to add voice, messaging, and Short Message Service (SMS) to apps. Pricing ranges from $0.002-$0.01/minute.
Avaya Scopia is a video conferencing software featuring mobile compatibility and web configuration among others. Pricing is customized.
Cloud CMA is a real estate software that features lead generation, listing alerts, and CMA tools among others. Prices start at $149.95/month.