You can message and share files inside your intranet without a server.
#1 Free OneDrive Client for Linux
Share and collaborate by syncing with any Git repository
The portable software collection
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
Free Email Backup Software | Email Backup App for Android
The cult-favourite eMail client formerly known as Qualcomm Eudora
Send Mime and Smime Emails to Any Type of Mail Server
Remote control your linux console encrypted trough Jabber chat service
SMS software
A Virtual Office web application developed using Free and Open Source
A free .NET library for accessing IMAP servers, written in C#
Software de Videovigilância Free