Copyright © 2006 Linux Care OÜ 1 “IST programme: new funding and collaboration opportunities” , Tallinn, Estonia Linux in Business use Linux. - ppt download
Install Open Source Groupware Citadel on Ubuntu 15.04 and Linux Mint | Unixmen
Citadel – Open source email and collaboration – Ubuntu Geek
5. User Groupware in practice - PC SOFT - Online documentation
5 Awesome Open Source Groupware Software Suite - nixCraft
Mail Server with Groupware (smtp software)
Install Open Source Groupware Citadel on Ubuntu 15.04 and Linux Mint | Unixmen
Groupware | Article about groupware by The Free Dictionary
5 Awesome Open Source Groupware Software Suite - nixCraft
Linux Servers
Sogo: Free Collaboration And Groupware Server For Linux
Top 13 Open-Source Groupware Solutions for enterprise
GitHub - EGroupware/egroupware: Web based groupware server written in PHP, forum at https://help.egroupware.org/
Top 13 Open-Source Groupware Solutions for enterprise
Zarafa: Professionelle Groupware-Server unter Linux - Kromer, Michael gebraucht kaufen
Groupware - The Horde Project
Replace Outlook with Evolution: A Linux Groupware Suite - gHacks Tech News
Citadel/UX - Wikipedia
Top 13 Open-Source Groupware Solutions for enterprise
How to Install Citadel Mail Server on Ubuntu 16.04 | by Alibaba Cloud | Medium
Top 13 Open-Source Groupware Solutions for enterprise
Best Free and Open Source Groupware Software - LinuxLinks
14 Best Linux Mail Server in 2023 (Free + Open Source) | Cloudzy
