Alternatives to Matrix.org

Telegram

Telegram is a cloud-based instant messaging and voice over IP service developed by Telegram Messenger LLP. It is a cross-platform messaging app for smartphones, tablets, and desktop computers. It is a secure, fast and free messaging and voice over IP service. Telegram is designed...

Tor

Tor (The Onion Router) is an open source software application that provides users with privacy and security on the Internet. It works by sending traffic through a network of relays (run by volunteers) which are distributed across the globe. This makes it difficult for any third-p...

Discord

Discord is a free voice and text chat application designed for gamers. It allows users to create and join servers to talk with friends, share images and videos, and play games. It also provides features such as voice and video calling, screen sharing, custom emojis, and more. The...

Skype

Skype is a popular video and audio conferencing software that allows users to connect with each other from anywhere in the world. It is often used for business meetings and other types of professional communications that would otherwise require people to be in the same room. Skyp...

Signal

Signal is a secure, private messaging application for all of your devices. It allows you to send text messages, voice and video calls, and multimedia messages to other Signal users. Signal also includes end-to-end encryption, which means that no one but the sender and the receive...

Slack

Slack is a business and enterprise communication platform used by millions of people around the world. It is designed to help teams stay productive and connected. Slack provides an easy-to-use platform for users to communicate with each other in real-time, with features such as g...

Hangouts

Hangouts is a communication platform developed by Google that allows users to easily send messages, make video and audio calls, and share files with other users. The Hangouts platform includes a web version, mobile app, and Chrome extension. It is integrated with other Google ser...

WhatsApp Messenger

WhatsApp Messenger is an app that allows users to send and receive messages, make voice and video calls, share photos, documents, location and other media, all over the internet. It is available for both iOS and Android devices. WhatsApp Messenger is primarily focused on securit...

Riot.im

Riot.im is an open source, secure, and decentralized communication platform for teams, communities, and individuals. It can be used as a communication tool for anything from remote work collaboration to video conferencing, text chat, voice calls, and file sharing. Riot.im is desi...

Mattermost

Mattermost is a self-hosted, open source, private cloud-based messaging platform designed for teams and organizations. It is designed to provide an easy-to-use and secure collaboration platform for organizations of any size. It provides rich features such as real-time messaging, ...

I2P

I2P (Invisible Internet Project) is a free, open source, peer-to-peer communication and file sharing application that enables users to communicate and share files securely and anonymously over the internet. It is a distributed, anonymous network that uses end-to-end encryption an...

Rocket.Chat

Rocket.Chat is a cloud-based collaboration platform that enables teams to communicate and collaborate in real-time. It is an open source, self-hosted solution that provides users with a wide range of features, including instant messaging, video conferencing, file sharing, voice a...

ZeroNet

ZeroNet is an open-source, decentralized web platform that offers peer-to-peer network support for hosting websites and applications. It is a distributed, secure, and privacy-focused platform that allows users to create and host websites and applications on the Internet without r...

Zulip

Zulip is an open source, real-time collaboration software and application designed to help teams communicate more effectively and efficiently. It provides an array of features such as instant messaging, threaded conversations, file sharing, and searchable archives. Zulip also off...

Freenet

Freenet is a free and open-source application that allows users to securely share and download files with other users in a distributed peer-to-peer network. It is designed to provide users with privacy, security, and anonymity by preventing third parties from tracking the informa...

Glip

Glip is a cloud-based collaboration and productivity platform developed by RingCentral. It allows users to communicate, manage tasks, and collaborate with teams, all in one intuitive, organized space. Glip offers an array of features that enable users to share files, have group c...

Gitter

Gitter is an online chat and networking platform designed to support collaborative software development. It enables users to interact with each other in real-time and work together on projects. Its user interface is simple and easy to use, enabling users to quickly create and joi...

HipChat

HipChat is a cloud-based team messaging and collaboration platform that helps teams to stay connected and organized throughout the day. It enables members to communicate in real-time through private and group chat rooms, and also provides the ability to share files, set reminders...

Discontinued https://alternativeapp.info/software/slack/ is acquiring Hipchat and https://alternativeapp.info/software/stride-by-atlassian/ from Atlassian. services will be discontinued after February 15, 2019. https://www.atlassian.com/partnerships/slack

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GNUnet

GNUnet is an open source software framework for decentralized, peer-to-peer networking. It provides a secure platform for communication and data sharing between users, applications, and services. It is designed to be robust, secure, and resilient to attack. GNUnet is able to run ...

Let's Chat

Let's Chat is a secure, cloud-based messaging and collaboration platform designed to make communication easier and more efficient in the workplace. It enables users to create and manage multiple chat rooms, share files, and collaborate on tasks within the app. It offers features ...

Discontinued As noted at https://github.com/sdelements/lets-chat/issues/781, the project is no longer in development as of August 2017. The latest version, 0.4.0, released in June 2015, can still be downloaded from GitHub along with the source code.

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Matrix.org

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