Zimbra - Email and Collaboration Suite

•    Java

Zimbra is the most capable open source email and collaboration suite available today. It provides support for Email, Shared calendar, Document management, Pop3, Address book and lot more. Mails could be tagged and search support is also provided. Zimbra is considered as an alternative to Microsoft Exchange Server.

Tiki Wiki CMS Groupware

•    PHP

Tiki Wiki CMS Groupware is a full-featured, web-based, multilingual (35+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware using PHP, MySQL, Zend Framework, jQuery and Smarty. Actively developed by a very large international community, Tiki can be used to create all kinds of Web applications, sites, portals, knowledge bases, intranets, and extranets.

Citadel

•    C

Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.

LogicalDOC Document Management - DMS

•    Java

LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.

mailcow-dockerized - mailcow: dockerized - 🐮 + 🐋 = 💕

•    PHP

Please see the official documentation for instructions. Important: mailcow makes use of various open-source software. Please assure you agree with their license before using mailcow. Any part of mailcow itself is released under GNU General Public License, Version 3.

Kopano - Collaboration made easy

•    C++

Kopano Core provides the foundation for groupware messaging enabling clients such as Kopano WebApp, Kopano DeskApp, mobile and sync clients. With its modular architecture, Kopano Core enables the possibility for a variety of setup scenarios, scalable from a very low-powered system to a multi-datacenter setup providing messaging capabilities to tens of thousands of users.

Kolab - Groupware Server

•    PHP

Kolab is a secure, scalable and reliable groupware server. Kolab helps to manage Email, Calendar, Contacts. It comes with a File Cloud and an advanced Task Management Module.

WebTop - Enterprise Collaboration suite

•    Java

WebTop is a Web2.0 application platform. It provides WebTop Services as the development framework and WebTop Groupware as a full featured bundle of services that form an Enteprise Cloud Collaboration solution with Mail, Calendar, Contacts and more.

SOGo - Fast and scalable modern collaboration suite (groupware)

•    Objective-C

SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

oMail (hMailServer Webmail)

This is an open-source version of OElite Webmail (oMail) is is part of the OElite platform. hMailServer was also natively supported in this project.

cerb - Cerb brings order to a busy team inbox with bot powered email management and workflow automation

•    PHP

High-volume email management that scales to millions of conversations per year. Shared mailboxes that provide a single point of contact for clients no matter who is on duty.

Tine-2.0-Open-Source-Groupware-and-CRM - Tine 2.0 main repository

•    HTML

Welcome to the Tine 2.0 Community Edition, the base of our popular Tine 2.0 Business Edition. In contrast to the so called "open core" approach, where only a subset of the software is released as open source, you'll find the complete sourcecode of all standard Tine 2.0 applications and features here. Like RHEL is the stable extract of Fedora, our Business Edition is a approved subset of stable code combined with a long term business support.

tine20 - Tine 2.0 main repository

•    HTML

Welcome to the Tine 2.0 Community Edition, the base of our popular Tine 2.0 Business Edition. In contrast to the so called "open core" approach, where only a subset of the software is released as open source, you'll find the complete sourcecode of all standard Tine 2.0 applications and features here. Like RHEL is the stable extract of Fedora, our Business Edition is a approved subset of stable code combined with a long term business support.

intranet - 리디주식회사 그룹웨어

•    PHP

Run make command from project's root directory.

kopano-webapp - Read-only mirror of the Kopano WebApp git repo https://kopano.com/products/webapp/

•    Javascript

WebApp provides all the familiar email, advanced calendaring and contacts features you need to be productive. It helps you by providing an overview of what matters to you, whether this is your incoming email, your weekly schedule or the contact details of that person you really need to call. Optional for development a pre-commit hook can be used, which runs JSHint.

team - Rust web app with Iron and Postgres

•    Rust

Rust web app with Iron and Postgres

ls.joyous - A calendar application for Wagtail

•    Python

Simple, multiday, and recurring events can be added to the calendar. Install the package.

i-librarian-free - I, Librarian - open-source version of a PDF managing SaaS.

•    PHP

You can download and execute installers for Windows 8, and 10 plus a DEB package and a console installer for Ubuntu, Debian, and its derivatives. An installer for Mac OS X is not available. These installers will install and/or configure Apache and PHP for you. If you don't want that, follow the instructions below to install manually.