SOGo: Open-source groupware solution to Share calendars, address books and mails

1. SOGo

   1 8 1,943 9.5 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.

   

2. Stream

   getstream.io featured

   Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

   

3. egroupware

   2 2 270 9.9 PHP

   Web based groupware server written in PHP, forum at https://help.egroupware.org/

   

   I hadn't heard of eGroupware before, so linky for others who are similarly curious: https://github.com/EGroupware/egroupware#readme (also GPLv2)

4. chat-server

   3 1 0 0.0 Go

   Discontinued Enterprise chat backend for grommunio (by grommunio)

   

   Interesting alternative. It was a bit muddled to figure out what it consists of, but this lists most:

   https://docs.grommunio.com/admin/introduction.html#architect...

   Chat bit was unclear:

   > grommunio-chat is a fork of an open source chat platform with authentication and integration enhancements

   Looks like "an open source chat platform" is mattermost?

   https://github.com/grommunio/chat-server/tree/release-7.8-gr...

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