Schleuder

GPG-enabled mailing list manager with resending-capabilities.

Communication GPL-3.0 Ruby

Visit Website Source Code

Discover more

Chaskiq

Full featured live chat, help center and CRM as an alternative to Intercom & Drift, Crisp and others.

Communication AGPL-3.0 Commons-Clause Ruby

6/5/2026 Details →

Chatwoot

Customer communication platform (alternative to Intercom & Zendesk).

Communication ⊘ Proprietary Ruby Docker K8S

6/5/2026 Details →

Courier MTA

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

Communication GPL-3.0 C deb

6/5/2026 Details →

DebOps

Your Debian-based data center in a box. A set of general-purpose Ansible roles that can be used to manage Debian or Ubuntu hosts.

Communication GPL-3.0 Ansible Python

6/5/2026 Details →

diaspora*

Distributed social networking server.

Communication AGPL-3.0 Ruby

6/5/2026 Details →

EmailRelay

A small and easy to configure SMTP and POP3 server for Windows and Linux.

Communication GPL-3.0 C++

6/5/2026 Details →