Cal.com

KommunikationAGPL-3.0FreemiumWebSelf-Hosted

Scheduling infrastructure for individuals and businesses with calendar sync and booking pages

GitHub Repository Official Website

GitHub stars

Alternative to

Zoom

Kommunikation

mailcow

Dockerized email server suite with webmail, antispam, antivirus, and administration interface

GPL-3.0Free

Tuta

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

GPL-3.0Freemium

SchildiChat

Matrix-based messenger with end-to-end encryption and a familiar messaging experience

Apache-2.0Free

Flarum

Simple and beautiful forum software with a fast, extensible, and mobile-friendly design

MITFree

Delta Chat

Decentralized chat application that works over email with automatic end-to-end encryption

GPL-3.0Free

Proton Mail

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

GPL-3.0Freemium

Cal.com

GitHub stars

Alternative to

mailcow

Tuta

SchildiChat

Flarum

Delta Chat

Proton Mail

Bewertungen

Cal.com

GitHub stars

Alternative to

mailcow

Tuta

SchildiChat

Flarum

Delta Chat

Proton Mail

Bewertungen

Cal.com

GitHub stars

Alternative to

Related Alternatives

mailcow

Tuta

SchildiChat

Flarum

Delta Chat

Proton Mail

Bewertungen

Cal.com

GitHub stars

Alternative to

Related Alternatives

mailcow

Tuta

SchildiChat

Flarum

Delta Chat

Proton Mail

Bewertungen