Signal

CommunicationAGPL-3.0FreeWindowsmacOSLinuxAndroidiOS

Private messenger with end-to-end encryption for secure text, voice, and video communication

GitHub Repository Official Website

GitHub stars

Alternative to

Communication

Tuta

Encrypted email service with end-to-end encryption, calendar, and contacts for secure communication

GPL-3.0Freemium

Session

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

GPL-3.0Free

Spacebar

Self-hostable Discord-compatible chat platform with federation and full API compatibility

AGPL-3.0Free

Dino

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

GPL-3.0Free

Linphone

SIP-based voice and video communication client for internet telephony on desktop and mobile

GPL-3.0Free

Zammad

Web-based helpdesk and customer support system with email, chat, and social media integration

AGPL-3.0Freemium

Signal

GitHub stars

Alternative to

Tuta

Session

Spacebar

Dino

Linphone

Zammad

Avis

Signal

GitHub stars

Alternative to

Tuta

Session

Spacebar

Dino

Linphone

Zammad

Avis

Signal

GitHub stars

Alternative to

Related Alternatives

Tuta

Session

Spacebar

Dino

Linphone

Zammad

Avis

Signal

GitHub stars

Alternative to

Related Alternatives

Tuta

Session

Spacebar

Dino

Linphone

Zammad

Avis