Flock Alternatives

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Element is an All-in-one secure chat app for teams, friends and organisations that allow you to own your conversations. With Element you can keep conversations in your control, safe from data-mining and ads. Element utilize the open and global Matrix network for message relay, protected by proven end-to-end encryption.

TeamSpeak is a VOIP application that provides military-grade encryption making it ideal choice for your company's, teams and gamers internal, closed-loop communications systems. TeamSpeak is known for its lag-free performance & unparalleled reliability and uptime.

Mumble is a free and open-source voice over IP application primarily designed for gamers. The application features a customizable in game overlay, application skins, conversation recording, and advanced voice activity detection. Anyone can download and use Mumble for free, but if you want your own server, you can rent a managed solution from the company behind Mumble, or host your own.

A free, unlimited and open-source chat software. Rocket.Chat have set out to be a replacement for email, HipChat & Slack and is provided as Software-as-a-Service (SaaS) or a self-hosted community edition. Rocket.Chat is feature packed and can be used for video conferencing, file sharing, voice messages and more. The software integrates with third-party services like GitHub, GitLab, JIRA, and Confluence and provides an API that can be used for authentication and integration across these services.

Pidgin is a chat application which lets you log into accounts on multiple chat networks simultaneously. Pidgin is developed and released fully free and open-source and provides a plugin architecture that allow anyone to build extensions and connections to new networks and third-party services.

Jitsi is an open-source project and software toolset that allows you to easily build and deploy secure video conferencing solutions. At the heart of Jitsi are Jitsi Videobridge and Jitsi Meet, which let you have conferences on the internet, while other projects in the community enable other features such as audio, dial-in, recording, and simulcasting.  Jitsi supports popular protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, Google Hangouts, OTR, ZRTP and more.

Zulip is an open-source real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones. Zulip provides modern apps for every major platform, powered by Electron and React Native. The software is 100% open source software, built by a vibrant community of hundreds of developers from all around the world.

Mattermost is an open-source, self-hostable enterprise team collaboration and messaging application. The software can be deployed to on-premis or to cloud instances. Mattermost is designed for internal use within organizations and businesses in financial services, government, healthcare, remote work, and enterprise DevOps, where teams use Mattermost to power collaboration at every stage of the DevOps lifecycle.

With Wickr you can control and protect your most critical communications. Unlike other video conferencing and collaboration platforms, Wickr Pro is end-to-end encrypted and built to scale for any Enterprise. Featuring unmatched security, total compliance, secure file transfer, SSO and MDM integration, Bots, full administrative controls and a whole lot more.

A web-based service for internal instant messaging and private chat for organizations. HipChat provides one-on-one and group and topic-based chat, as well as cloud-based file storage, video calling, searchable message-history and inline-image viewing. You can use HipChat natively on your desktop or mobile phone, or web browser. HipChat is available for Android, iOS, macOS, Linux, Windows and the Web.

Bitmessage is a decentralized, encrypted, peer-to-peer, trustless communications protocol. With Bitmessage you can send encrypted messages to a person, or to multiple subscribers.