osTicket

커뮤니케이션GPL-3.0FreeSelf-HostedWeb

Support ticket system that routes and manages customer inquiries from email, web, and phone

GitHub Repository Official Website

GitHub stars

Alternative to

Zendesk

커뮤니케이션

Zammad

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

AGPL-3.0Freemium

Element

Secure messaging app built on the Matrix protocol with end-to-end encryption and federation

Apache-2.0Free

Zulip

Organized team chat with topic-based threading that combines email and chat for productivity

Apache-2.0Freemium

Spacebar

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

AGPL-3.0Free

Signal

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

AGPL-3.0Free

mailcow

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

GPL-3.0Free

osTicket

GitHub stars

Alternative to

Zammad

Element

Zulip

Spacebar

Signal

mailcow

리뷰

osTicket

GitHub stars

Alternative to

Zammad

Element

Zulip

Spacebar

Signal

mailcow

리뷰

osTicket

GitHub stars

Alternative to

Related Alternatives

Zammad

Element

Zulip

Spacebar

Signal

mailcow

리뷰

osTicket

GitHub stars

Alternative to

Related Alternatives

Zammad

Element

Zulip

Spacebar

Signal

mailcow

리뷰