OpenTok!

Echoplexus is an anonymous, web-based, IRC-like chatting platform that makes its best effort to respect your privacy. It allows you to create public or private channels. You can encrypt your chats. You can secure a pseudonym for linkable anonymity. You can code and draw together in real time. You can make free and secure Peer2Peer video and voice calls with the people in your channel using WebRTC.

Nexmo provides innovative communication APIs that bridge traditional voice and text services with cloud communications.

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.

A free, open-source, out-of-the-box audio conferencing app exposed via an API. Talk with your teammates, friends, and others at the push of a button.

The Vidyo.io platform provides high quality video with strong error resilience so you can build WebRTC, mobile, and native multiparty video chat apps. No matter what platform you’re building for, Vidyo.io provides a consistent, simple API on mobile, desktop, and browsers. So you can focus on building great user experiences, not learning new APIs. Vidyo.io is powered by a global cloud equipped with technology that continuously optimizes the video connection of each endpoint ensuring a high degree of reliability. »

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.

The Hangouts API provides the programming interface to Hangouts video calls. It provides a JavaScript interface that enables your app to do such things as list the Hangout participants, share data between instances of your app in the Hangout, control some aspects of the user interface, and control the microphone, camera and speaker settings.

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.

Linkello provides easy-to-use video calling right from your browser.

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