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A port forwarding app written in Java that lets you easily forward UDP ports and TCP ports with advanced options, including by setting limits/restrictions and flipping between protocols as data is forwarded somewhere else. If using the GUI version, it lets you create multiple tunnels and manage them.
jTCPfwd started as a simple Java command line tool to forward TCP ports. Lots of other features are added, for example for forwarding TCP connections over reverse TCP connections, UDP/HTTP tunnelling or writing files to a network share.