Skype is the most popular free voice-over IP and instant messaging service globally. It allows users to text, video and voice ...

Basecamp is a web-based project collaboration tool that allows groups of people to share files, meet deadlines, assign tasks, ...

Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group cha ...

Quip is a modern word processor that enables you to create beautiful documents on any device, including the iPad, iPhone, and ...

Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost bring ...

Slack brings all your communication together in one place. It’s real-time messaging, archiving and search for modern teams.

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework. It is a great solution for co ...

Glip is instant messaging for teams and businesses to communicate and get work done at the same time. In Glip you work where y ...

Gitter is a chat and collaboration tool for developers and users. It's a place for developers to talk.

KEY FEATURES

• Unlimited ...

Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both ...

HipChat is an instant messaging service designed for companies and teams. It has persistent chat rooms, one-to-one chat, searc ...

Self-hosted chat for small teams.

Features and Stuff BYOS (bring your own server) Persistent messages Multiple rooms New m ...

Matrix.org is a growing ecosystem for open, decentralised chat, VoIP and IoT communication. The Matrix project defines an ope ...

Google Groups is all about helping users connect with people, access information, and communicate effectively over email and o ...