1)   x Chat Free 2.9
x Chat Fre is a private one-to-one chat program for Intranet. It is user-friendly, drag and drop support and fully customizable. It comes with colourful text chat, file transfer, drawing board, network tools and encryption security features.
Network Chat, Network Utilities, Text Chat,

 2)   LanToucher Network Chat 1.0b3
LanToucher Network Chat is small and easy-to-use chat software for your small office or home LAN (Local Area Network). Serverless (P2P) messaging; No dedicated server or Internet connection is required.
chat messenger, lan chat, network chat, intranet chat, instant chat, winpopup, messenger service, net send, IM, EIM,