IXSF Messenger is a java-based messenger with file transfer option. Java Runtime Environment (JRE) 1.4 or higher is required. This application is built in two parts - server and client. Server part serves client's requests.
Accord Odette is a Java framework for developing your own Odette OFTP2 client/server, respecting your needs of integration and functionalities. It comes with base client and server classes for TCP/IP and to bridge connections through X.25 and ISDN.