Dino

CommunicationGPL-3.0FreeLinux

Modern XMPP chat client for the desktop with end-to-end encryption support

GitHub Repository Official Website

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Communication

Mattermost

Secure team messaging platform with channels, file sharing, and workflow automation for enterprises

otherFreemium

Matrix Synapse

Reference homeserver for the Matrix decentralized communication protocol with federation support

AGPL-3.0Free

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Full-featured email client with calendar, contacts, and chat integration across platforms

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Proton Mail

End-to-end encrypted email service based in Switzerland with zero-access encryption architecture

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Session

Anonymous messenger requiring no phone number with decentralized network and end-to-end encryption

GPL-3.0Free

Rocket.Chat

Team communication hub with messaging, video calls, file sharing, and omnichannel support

MITFreemium

Dino

GitHub stars

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Mattermost

Matrix Synapse

Thunderbird

Proton Mail

Session

Rocket.Chat

Avis

Dino

GitHub stars

Alternative to

Mattermost

Matrix Synapse

Thunderbird

Proton Mail

Session

Rocket.Chat

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Dino

GitHub stars

Alternative to

Related Alternatives

Mattermost

Matrix Synapse

Thunderbird

Proton Mail

Session

Rocket.Chat

Avis

Dino

GitHub stars

Alternative to

Related Alternatives

Mattermost

Matrix Synapse

Thunderbird

Proton Mail

Session

Rocket.Chat

Avis