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Twilio offers developers a powerful API for phone services to make and receive phone calls, and send and receive text messages. Their product allows programmers to more easily integrate various communication methods into their software and programs.

It is a live chat support & messaging application that focuses on successful communication between businesses and their customers.

LiveChat provides a live chat application with help desk and web analytics functionalities, allowing online businesses to communicate with visitors in real time.

Olark is a lightweight tool to chat with visitors to your website using your existing instant messaging client. Visitors to your website appear as buddies on your Buddy list, their messages to you appear as IMs.

Zopim is focused on serving the needs of web users that hasn’t been met by other chat solutions: the need for usability, convenience and simplicity of design

Nexmo connects your apps directly to carriers around the world. Integrate SMS and Voice messages using one simple API. Use Nexmo Verity to register users, verify transactions, and implement two factor authentication.

Postscript lets you easily create and manage SMS marketing campaigns with detailed analytics designed to increase sales and revenue, not just clicks.

Drift is a messaging app that makes it easy for businesses to talk to their website visitors and customers in real-time, from anywhere.

Chat with website visitors, integrate your favorite tools, and deliver a great customer experience.

Braze is a comprehensive customer engagement platform that powers relevant and memorable experiences between consumers and the brands they love.

Agora.io provides building blocks for you to add real-time voice and video communications through a simple and powerful SDK. You can integrate the Agora SDK to enable real-time communications in your own application quickly.

Plivo provides basic building block APIs in the form of Plivo XML and HTTP API, to create telephony apps, so developers can completely do away with learning the nitty-gritty of the telephony plumbing.

At MessageBird we believe that communicating with a business should feel as natural as communicating with a friend. That's why our SMS, Voice and Conversations APIs continue to revolutionize company-customer interactions.

It adds the clarity and emotion of face-to-face communication to your brand whether you're developing for the web, iOS, or Android. We make the integration of high-quality live video a breeze so that you can focus on building a great product.

It is a global leader in omnichannel engagement. We help our clients and partners overcome the complexity of consumer communications & grow their business.

It is a customer support tool for instant messaging channels which can help businesses provide exceptional customer support through their websites or social media channels.

A Communications Platform as a Service company offering a full suite of voice, messaging, and 9-1-1 APIs, all built atop the company's own all-IP voice network.

It connects to your favorite platforms to power up every conversation you have. Ask fewer questions and get straight to the point.

BulkSMS.com is a leading SMS messaging service provider offering two-way SMS communication services. The BulkSMS gateway reaches across borders and connects to over 800 mobile network operators world-wide.

You don't need yet another chat client. Talk with your customers using your existing Slack service.

SnapEngage is a powerful Live Chat solution. Without installing any software, your Sales and Support teams can chat with your website visitors while they browse. Agents are using their preferred instant messaging solution and don't need to learn yet another system.

It is a cloud telephony platform that powers communication for enterprises, startups and small and medium enterprises in India and Southeast Asia. They provide APIs that help companies devise their own communication flow.

Tropo is a powerful yet simple API that adds Voice and SMS support to the programming languages you already know.

It is a cloud communication platform offering powerful messaging solutions to empower business communications. It provides bulk SMS service provider offers transactional & promotional bulk SMS solutions to enterprises via powerful & robust bulk SMS gateway internationally.

Slaask enables you to set up a dedicated live chat channel on your Slack.

Reach your customers in a matter of minutes with our instant delivery. Find a Bulk SMS API for every application/technology.

VoxImplant is a communications cloud platform built and designed for developers. Use the VoxImplant mobile SDK, telephony integration, or web sdk to build anything from softphones, click-to-call, automated surveys, cloud contact center or PBX, to cloud IVR and call tracking.

Create a better customer experience with SMS, Chat Apps, Video Interaction & Voice. It’s integrated communications platform as a service (CPaaS) streamlines multiple communications channels into a single dashboard.

If you have questions or feedback about our apps, we're always listening and happy to help!

It is a free live chat for your website. Start real-time conversations with your web visitors, answer their questions and boost your online sales. An unlimited free live chat solution which will probably be most useful for small and medium enterprises.

It is a business mobile messaging service provider that enables businesses of all sizes and industries to deliver and manage SMS text messages from PC, web, email or API.

It is a 100% open source conversational marketing platform build as an alternative for Intercom, Drift, and others, currently under active development. It is a platform that enables chat comunication with users in app or via campaigns (in app messages or newsletters). The platform is a Ruby on Rails app serving a graphql API which is consumed by a React application. It has minimal dependences , Postgres & Redis and interoperates with cdn providers like Amazon s3 and Amazon SES for email delivery.

Pushnami enables you to capture your audience, intelligently market to them across web, mobile, and email, and grow your revenue. Streamline your messaging strategy with features like machine learning,automated drip campaigns, and customize

With Talkus, Slack becomes the place for your team to communicate with customers, personally, on your website by live chat or by email, phone or SMS.

Reduce development cost and complexity, and increase developer happiness, with the most powerful companion to any conversational AI project.

Send and receive SMS globally with the SMS gateway. Trust your business messaging with reliable, direct routes, and lightning fast message delivery.

It is an Open Source, low-latency and high-quality voice-chat program written on top of Qt and Opus. There are two modules in Mumble; the client (mumble) and the server (murmur). The client works on Windows, Linux, FreeBSD and macOS, while the server should work on anything Qt can be installed on.

Quickly add Voice, Video, SMS to your web and mobile applications. It is a communication platform which provides APIs that help clients quickly add Voice/Video/SMS to any application.

This application aims to provide a reliable avenue for your business' customer support system to engage with your customers and cater to their requests.

It is an open-source live customer chat app written in Elixir. We offer a self-hosted alternative to Intercom for companies that are security & privacy conscientious. We're starting with chat, but long term, we want to handle all customer messaging.

Hassle-free live chat for customer support & business growth. Increase the ROI on your marketing efforts. Get started now to connect with real time visitors.

It is a virtual assistant that answers phone calls, chats with customers, provides in-app help, takes orders, and provides support.

It integrates with your system and automates all customer support related activities in one click. It provides omnichannel support via Email, website live-chat, Facebook, Twitter, WhatsApp, Slack etc., and deliver a consistent customer experience across all channels.

AI software for marketing and sales engages with leads through personas to help find customers more quickly.

Engage your customers from WhatsApp, LINE, Facebook Messenger & other popular social media messaging apps all from one centralised dashboard.

Voice broadcasting and text messaging with Call-Em-All's automated messaging service for groups and organizations of all sizes.

Chaport is a multi-channel customer communication platform with a live chat, chatbots, and a knowledge base. It helps businesses engage with website visitors, get more qualified leads, increase sales, and improve customer support.

It is a perfect communication platform that enables businesses to connect, engage and interact with their users with help of its SMS, Voice and APIs.

It makes it easy for you to work with customer teams, rather than just supporting each user independently. B2B companies with team dashboards can embed our messaging widget to offer off-the-shelf shared support channels to their users.

It is a plug and play app, to send & receive, single or bulk SMS, MMS , WhatsApp, Telegram & CTI from salesforce.