What alternative is there to writing a TCP/IP data relay?

Question

I am about to write a tcp/ip data relay - application that passes a one way stream of data from one host/port to another host/port. Initially it will be generic, but later on i will customize it to the need of a specific business request.

I am guessing that something generic already exists out there so my question is:

Has anyone used a third party (preferably open source) data relay in a production environment, if so what is, and do you recommend it?

Any platform is fine.

Thanks.

Answer 1

GNU netcat can be configured to do this, and is open source, multi platform.