Braze

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.

Intercom is a customer communication platform with a suite of integrated products for every team—including sales, marketing, product, and support. Have targeted communication with customers on your website, inside apps, and by email.

Customer engagement platform for tech savvy marketers sending personalized, data-driven marketing, product, and transactional messages. Ideal for mid-market SaaS, FinTech, EdTech, mobile apps, marketplaces companies, and more.

Freshchat is a modern messaging software built for teams who want to ace customer conversations—marketing, sales, or support.

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.

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 is a software vendor for free and open-source customer experience management, digital asset management, product information management, multi-channel publishing and e-commerce software.

Autopilot’s intuitive drag and drop Journey canvas allows you to send the right message, on the right channel, at the right time. Automate your marketing, send personalized messages, build workflow and process in Salesforce, and more.

It is the first ECRM–an Ecommerce CRM designed for building personal and profitable relationships with your customers at scale. It uses customer insight, data, and smarter email marketing automation at scale. With the best customer experience, your brand will never blend in.

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 mobile engagement platform that helps forward-looking brands like Grab, Tinder, and Tesco meet the real-time needs of their customers.

It is a free and easy-to-use tool for businesses and organizations to manage their online presence across Google, including Search and Maps. If you verify and edit your business information, you can both help customers find your business and tell them your story.

It is a live chat service which allows you to communicate with your customers easily, also with the help of chatbots. It is designed specifically for the WordPress community.

Vero is an event-driven email marketing platform for engineering, marketing, and product teams - it gives you the visibility and clarity to help you collaborate and move faster in designing and sending emails using real-time customer data.

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 empowers digital marketing leaders and business owners with the only #omnichannel customer engagement platform built to accelerate business outcomes.

It is a personalization and engagement solution for businesses and organizations designed to improve sales and drive customer engagement throughout their whole experience.

Threads is an extremely flexible and powerful way to engage customers by building workflows and sending triggered emails.

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.

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.

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

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.

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

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.

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 helps B2B marketers drive new business & expand relationships with high-value accounts by orchestrating human connection at scale.

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 offers an omni-channel live chat and AI-powered chatbots to generate more leads for your business and/or delight your customers with advanced customer service.

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.

PersistIQ is an all-in-one outbound sales platform. Sales teams use PersistIQ to turn cold leads into sales opportunities.

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

It is a lead generation platform. Lead generation doesn’t have to be painful. Drive growth with targeted Sales leads and increase sales by quickly finding, connecting and engaging with qualified prospects.

A data-driven marketing technology company that helps brands acquire more customers, retain them for longer and grow their value.

Turn trial users into paid users & inactive users into engaged users with targeted, behavior-driven lifecycle messaging.

It makes it easy to keep and manage a changelog for your products. Keep your users up to date and engaged with every update your team ships.

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

It is a conversational lead generation platform. Leadoo helps companies to convert more leads from website visitors.

Dashly platform helps SaaS companies improve communications with their customers. Convert website traffic through every step of the funnel and reactivate inactive users with live chat, bots, and targeted messages.

It is a sales productivity phone service that makes all of your calls searchable, trackable, and archived in your CRM sales.

It helps new brands and startups build an audience while they focus on building a product

Revolutionary SMS Platform that Has Proven to Deliver 10x Better Results than a Traditional Email Auto-Responder. It is the Most Powerful SMS Platform For creating and managing text message campaigns with your subscribers and customers

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.