This is an open source port mapper written in java nio no-blocking socket model. Open Port Mapper allows multiple ports mappings, and it provides the functionality of specifying allow list and deny list.
An XML firewall for web services. This firewall will provide a means of adding security to any webservice of any platform. Standards such as SAML and WS-Security will be implemented.
Nettunnel is CLI and GUI application, as well as library for tunneling TCP connections between two firewalled computers through mediator server.
Tunnelizer is an application suite that allows you to tunnel TCP and UDP traffic through a firewall or proxy server. Communication between the tunnel ends can be either direct or through a SOCKS or HTTP proxy server, and can be optionally encrypted.
jNuFw is a library and a client written in Java to the authenticating firewall NuFw.