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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.
iplist is a list based packet handler which uses the netfilter netlink-queue library (kernel 2.6.14 or later). It filters by IP-address and is optimized for thousands of IP-address ranges.
A very simple to use java firewall testing tool. Ever wanted to verify that a TCP or UDP network path is actually open? This tool has both server and client modes so you can test network paths between any two computers that have the Jave JRE installed.
A lightweight, compact, stand-alone, platform-independent application to forward TCP (over IPv4 or IPv6) connections to another host. Possible uses include - but not limited to - firewall hacking, tunneling, proxying, fortifying ADSL, creating multi-plat
Siganture Translator is a Java application which can translate signatures between different IDS's and Common Intrusion Detection Signatures Standard (CIDSS).
A complex software (firewall, network access informant, traffic calculator) for xDSL subscribers of Sibirtelecom company. Only Novosibirsk city branch supported at now.
deface-no-tnx is an anti-defacement system that monitors your Web files and notifies you about unallowed changes. It also replaces the defaced page with a standard "error" page,so that no offensive/joking content can be frauodolently added to your site
A simple port-relaying program written in Java; sits on specified ports for either TCP or UDP, re-sends packets to the given IP. Doesn't forward packets, actually receives and re-sends them. Could be handy to learn Java Sockets/networking. Public Domain.