Kixie

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 cross-platform mobile messaging app for iPhone, BlackBerry, Android, Windows Phone and Nokia. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media.

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.

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.

Since RingCentral is cloud based, you enjoy the freedom to connect and manage multiple locations, devices and workers within your cloud phone system. You can easily customize users, departments, and call handling rules. No matter where you, or the users, are. You only need a high-speed Internet connection and your phone system is ready to work lightning fast, anytime and anyplace. There’s no PBX hardware.

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.

Aircall is an app that you can install and setup in a few minutes. It lets you buy one or several phone numbers across the world, add teammates to your dashboard, and place & receive calls on your existing devices. Everything is managed inside the Aircall app.

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 an open standards IP PBX that offers complete Unified Communications, out of the box. Suitable for any business size or industry it can accommodate to your every need; from mobility and status to advanced contact center features and more, at a fraction of the cost.

It is a graphical programming interface that provides designers access to parametric modeling and data-driven customized workflows for building information modeling (BIM). It can run as an addin for Autodesk Revit and Autodesk Vasari, with the ability to manage Revit project files and family definitions, or it can run as a standalone program. It allows users to control complex geometry, construct parametric relationships, manage data, and automate tasks.

It is a pure-cloud business communication platform that's in tune with the way your team works . Connect your team with a business communication platform that powers voice, video, messages, and meetings across your existing devices.

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 is a cross-platform messaging app. Privacy isn’t an optional mode – it’s just the way that Signal works. Every message, every call, every time.

It is a cross-platform instant messaging and voice over IP application provided as freeware for the Microsoft Windows, macOS, Linux, Android and iOS platforms.

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.

Sound more professional and stay connected with Grasshopper, the Virtual Phone System designed for entrepreneurs. Grasshopper works just like a traditional phone system, but requires no hardware to purchase or software to install.

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.

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.

Stay connected, organized, and on task with an easy-to-use phone solution that fits organizations of any size.

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.

SendHub is a simple, fast, web and mobile communication tool that provides businesses, and organizations, with a call and messaging solution to reach small and large groups of people.

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

Ring your mobile phone, computer, and desk phone at the same time. Answer calls and switch seamlessly between devices. Use your personal device with a business phone number so you're always reachable.

All-in-one phone system for startups and small businesses. It adds a work phone number to your existing devices. No need to carry two phones or extra SIM cards.

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 an Intelligent Phone System for run companies by managing call and forward to anyone. It is very helpful to build a relationship with clients

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.

It is an Internet-based phone network that enables clients to make and receive calls from any device connected to the Internet. It enables you to setup your business telephone system without the heavy hardware and wiring expenses.

Create unique conference rooms on demand, without having to reuse the same IDs. Self-hosted free option works for most, but commercial licensing is available for more features and support.

It offers a solution where you’d get a business phone number with lots of great features without having a full office setup, extra cell phone plan, and without paying high prices for the communication system.

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

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

It is a modern VoIP phone system for better call automation, collaboration, and productivity. It is a cloud phone system that integrates with 100+ business apps.

Build a full text marketing program in minutes without writing any copy or code

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.

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

Get free SMS verification codes for online accounts or rent a private number for enhanced privacy. Worldwide coverage including USA, UK, Canada, and more. Secure, reliable, and easy to use.

Kloud 7 is a business communications service provider that offers tailored solutions for businesses to grow faster.

Dial in by phone or computer with up to 1,000 callers and experience HD quality sound during each conference call.