Free groupware

phpBB is an Internet forum package written in the PHP scripting language. The name "phpBB" is an abbreviation of PHP Bulletin Board. Available under the GNU General Public License, phpBB is free and open-source.

Zimbra Collaboration, formerly known as the Zimbra Collaboration Suite (ZCS) before 2019, is a collaborative software suite that includes an email server and a web client.

Content management system, free and open-source wiki software

BigBlueButton is a free software virtual classroom software program designed for online education. It is primarily accessed through Learning Management Systems, providing engagement tools and analytics which enable educators to interact with their students remotely.

EGroupware is free open-source groupware collaboration software intended for businesses from small to enterprise. Its primary functions allow users to manage contacts, appointments, projects and to-do lists. The project releases its software under the terms of GNU General Public License (GPL).

open source online office suite

Phorum is an open-source message board system written in PHP.

LogicalDOC is a proprietary cloud-based document management system that is designed to handle and share documents within an organization. LogicalDOC is a content repository, with Lucene indexing, Activiti workflow, and a set of automatic import procedures. The system was developed using Java technology.

Gobby is a free software collaborative real-time editor available on Windows and Unix-like platforms. (It runs on Mac OS X using Apple's X11.app.) It was initially released in June 2005 by the 0x539 dev group (the hexadecimal value 0x539 is equal to 1337 in decimal). Gobby uses GTK+ for its GUI widgets.

FUDforum is a free and open-source Internet forum software, originally produced by Advanced Internet Designs Inc., that is now maintained by the user community. The name "FUDforum" is an abbreviation of Fast Uncompromising Discussion forum. It is comparable to other forum software. FUDforum is customizable and has a large feature set relative to other forum packages.

Kolab is a free and open source groupware suite. It consists of the Kolab server and a wide variety of Kolab clients, including KDE PIM-Suite Kontact, Roundcube web frontend, Mozilla Thunderbird and Mozilla Lightning with SyncKolab extension and Microsoft Outlook with proprietary Kolab-Connector PlugIns.

Internet forum software

open-source web-mail

open-source collaboration software

OpenKM is a document management system that provides a web interface for managing nonspecific files. It has a Free/Libre Community Edition, and a proprietary Enterprise Edition. OpenKM includes a content repository, Lucene indexing, and jBPM workflow. The OpenKM system was developed using open technology (Java, Tomcat, Lucene, Hibernate, Spring).