IP messenger
features:
* Multi Platform ( Windows, MacOS X and Unix ).
* Open source and Free download.
* Allows File and Folder transfer along the network.
* Supports Broadcast Messages to a range of IP address.
* You can lock your message with a password when its sent to other user.
* You can even set your status.
* Supports NIC extension in the latest version.
* Messages can be logged in case you accidentally close the message box.
* Shows the Ip address, login user, machine name of the other users.
sourse code :
http://ipmsg.org/archive/ipmsg211src.zip