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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.

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.

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.

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.

TeleOSS provides high-throughput SMS gateway software, SMPP/SIGTRAN support, and global messaging solutions.

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.

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.

SendBird is a Messaging SDK, Chat API, and fully managed chat infrastructure for your mobile apps and websites. Embeddable chat for iOS, Android, JavaScript, Unity, .NET.

Use the Messaging API to build bots that provide personalized experiences for your users on LINE. You associate your bot with a channel on the LINE Platform. The bot works behind the LINE Official Account that is generated when you create the channel if you operate the account in bot mode.

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

It is a cross-platform mail client library built on top of MimeKit. The main goal of this project is to provide the .NET world with robust, fully featured and RFC-compliant SMTP, POP3, and IMAP client implementations.

As soon as a mailbox is connected, we create a metadata index of its content starting from the most recent emails which become available from the API within seconds. Context.IO takes care of synching email data for your app so you don't have to build, scale and maintain this infrastructure yourself. Focus on what's unique to your business, we'll manage the technical details of integrating with arcane email server protocols.

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.

The Twilio API for WhatsApp provides developers all over the world with a simple, reliable, and officially supported way to use the WhatsApp Business API. They can now easily build messaging experiences that combine the ease of use of the Programmable SMS API with the global reach of WhatsApp.

A full-featured email creation and transfer class for PHP. It is a class library for PHP that provides a collection of functions to build and send email messages. PHPMailer supports several ways of sending email: mail() , Sendmail, qmail & direct to SMTP servers.

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

Sinch makes it easy for developers to add voice, messaging and SMS to their apps with just a few lines of code. Enrich your apps with communications that your users will love.

Add powerful communication features to your mobile app and data services for your backend<br>

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 allows sending email directly from Javascript, with no backend development. The developers create one or more email templates (dynamic content supported) and then trigger an email using our Javascript SDK, specifying the template, and the dynamic parameters for rendering the email.

Chatkit is designed to make it as simple as possible to add chat to your app. It lets you add 1-1 and group chat to your app, along with typing indicators, file attachments and storage, user online presence and a flexible permissions system.

Chat API and SDK. With a beautiful UI Kit, easy to use React Components and powerful API. Add Chat to any application in a matter of hours. The tech uses Go, RocksDB and Raft. By the creators of Stream, the API that powers activity feeds for more than 300 million users.

Layer's asynchronous messaging fabric is capable of transporting payloads of any type. Get your users talking with chat, voice or video messaging. Pull them back in with push. Connect friends, colleagues or perfect strangers seamlessly.

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.

TalkJS provides a chat API & Javascript SDK with a pre-built UI that allows developers to add chat between users on websites and apps in hours instead of months.

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

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.

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.

CometChat offers a comprehensive in-app chat SDK platform that equips businesses with the tools to integrate real-time chat, voice, and video into their applications.

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.

It gives powers to chat commerce by helping you reach and engage customers through SMS, WhatsApp and other social channels.

LiveKit is a set of APIs and SDKs which make it easy to build and scale live video and audio features in your application. Use cases include interactive live streaming, video calls, communications in games, and robotics teleoperations.

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

mailparser.io is a web-based email processing software which allows you to pull any kind of data from incoming e-mails based on custom parsing rules. The parsed data can be sent to any API with webhooks.

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.

Moxtra is the contextual communication + collaboration layer for your mobile and web applications|. Enhance user engagement by adding in-app communication+collaboration. Integrate chat, voice meetings, screen sharing and recording, and multimedia annotation. The Moxtra Cloud is mobile-first and is built to scale on demand to meet your growing needs.

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

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.

It is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing.

An open and extensible chat SDK and APIs for building powerful 1:1 and group chat quickly. Build core chat features quickly, extend functionality with a rich plugin library and customize with programmable Functions-as-a-Service. Powered by the PubNub Network.

Add In-App User-to-User Communication into Mobile Apps & Websites, with rich & engaging Text Chat, Video, and Audio Calling experiences, to Increase User Engagement and Enable new Revenue Streams.

It brings rich communication APIs to all your applications across any device, on any platform, using the same reliable and secure infrastructure that powers Microsoft Teams.

Add video and audio chat to any app, in minutes. Daily's APIs help developers build the best possible video experiences, quickly and easily. Use our Prebuilt UI or build completely custom video conferencing interfaces.

It is a simple and secure mobile and web chat library that enables you to add messaging in just a few minutes on your android, iOS, and web apps. No need to develop or maintain any infrastructure.

It is an API-first email hosting service with a user-friendly interface. It provides affordable scalability for small & large businesses using dedicated email servers without any per-user/per-domain limits. Furthermore, the powerful API enables you to meet your changing business requirements with ease.

Popcorn Notify is designed to be an effortless method for sending emails and text messages from your code. Client libraries are simple to install and are available on pip and npm.

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