You can message and share files inside your intranet without a server.
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
The cult-favourite eMail client formerly known as Qualcomm Eudora
ERP, IP PBX, Accounting, CRM, Time tracking, and etc.
Encrypting E-Mail Client
Fully decentralised secure p2p communication program
Simple and lightweight IM client
An instant messaging client for XMPP networks