Google+ Hangouts API!

Twilio is a web-service API that lets you use your existing web languages and skills to build voice and SMS applications. We focus on building a simple, powerful, pay-as-you-go communications platform so that you can focus on what you do best.

TokBox makes it easy to add video chat to your site or mobile application using either the OpenTok API or OpenTok Widgets. Supports WebRTC.

Plivo is a voice and SMS API platform that enables developers and enterprises to build powerful apps with great features. With 24/7 free tech support and low prices, Plivo can help your business scale globally.

SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging. We've taken care of all the complicated details and harnessed the sophisticated technology necessary to bring you a simple solution for sending SMS text messages from a web or desktop application.

SightCall offers comprehensive real-time video APIs and Mobile SDKs that makes it simple to embed video calling and video conferencing into any application. SightCall provides a WebRTC Platform for healthcare, customer service and enterprise collaboration and has prepackaged integrations for Salesforce and Zimbra.

Aculab Cloud presents a way of creating automated telephony applications by handling all the telephony resources in a cloud-based platform. Through the use of simple, high-level language APIs, Aculab Cloud makes it easy for you to create telephony applications that control inbound and outbound telephone calls.Your application can run on your choice of server, in a location of your choice and you do not need to buy any specialist telephony equipment, nor do you need to have knowledge of how the telephone network works. Aculab takes care of the management requirements of the cloud telephony platform for you, freeing up your valuable time and resources to let you focus on innovation and application development. »

AddLive leverages WebRTC to allow anyone to easily add video and voice conferencing to their application.

If your reps or customers are remote, you should check out Blitzz.co.

ExpressText is a SMS Marketing provider that allows anyone with access to a computer and internet connection to utilize mobile marketing, one of the most effective forms of consumer advertisement. With our service, individuals and businesses can manage and execute effective SMS marketing campaigns to increase revenue, bring awareness to their brand, and create a stronger market presence.

SMSAPI.com is browser platform for bulk SMS and other SMS marketing solutions. SMSAPI offers bulk SMS, MMS, voicemailing, HLR services, shortcode, SMS notifications, newsletter SMS, MMS coupons, mail2SMS, two-way SMS and other mobile services.

SMS Marketing and Marketing Automation software for Mass SMS, internal communications & emergency alerts. #1 Text Messaging Service used by Fortune 500s.