Open Source Java Firewall Software

The UPnP PortMapper can be used to easily manage the port mappings/port forwarding of a UPnP enabled internet gateway/router in the local network.

NetGuard is an open-source Android firewall app that lets users control internet access on a per-app basis without requiring root access, making it a straightforward and flexible way to improve privacy and data usage management on mobile devices. By creating a local VPN service on the device, NetGuard intercepts and selectively blocks or allows network traffic for individual applications and addresses, supporting both Wi-Fi and mobile connections according to user preferences. This means you can block internet access for specific apps to save bandwidth, extend battery life, or prevent unwanted background connections while still letting other apps communicate normally. NetGuard’s interface is simple, with toggles to allow or deny access and optional settings for screen-on behavior, roaming, system apps, and notification of internet usage, giving users fine-grained control over network behavior.

Source: https://github.com/AlizerUncaged/HTTP-Injector respite is a SSH/openVPN client that allows you to connect to the internet with custom injected HTTP Proxy headers. This application requires Java (https://www.java.com/en/download/) and .Net 4.5 (https://www.microsoft.com/en-ph/download/details.aspx?id=42642 .Net 4.5 is already preinstalled in Windows 10). There are many SSH and OpenVPN Server providers in the internet, one is https://www.tcpvpn.com HTTP Proxy responses override (source code): https://github.com/AlizerDoesJava/respite-proxy-override Please rate, any feedback is appreciated. The application and server providers are free.

VTD-XML is the next generation XML parser/indexer/editor/slicer/assembler/xpath-engine that goes beyond DOM, SAX and PULL in performance, memory usage, and ease of use.

A java wrapper for popular "libpcap" and "WinPcap" libraries. Accurate full API translation. Packet buffers delivered with no copies. Send custom packets, gather statistics. Comprehensive and easily extensible DPI engine.

SonicReader is used to view and save reports of the internals of a Sonicwall Configuration file. This is useful for those people that wish to know the settings within their saved Sonicwall Configs. I have no affiliation with Dell Sonicwall. Please do not contact Dell Sonicwall regarding the use of this program.

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.

winKnocks is an encrypted(DES) port knocking tool. Knock sequences are defined through XML files; users specify: number of packets of each knock sequence, payload and header of each packet. Logging capability. Generation of smoke packets.No replay-attack

Siganture Translator is a Java application which can translate signatures between different IDS's and Common Intrusion Detection Signatures Standard (CIDSS).

Windows Port Knocking. A Windows implementation of port knocking developed to work alongside an existing firewall (the free CHX-I Packet Filter v3.0).

jIPFire is an easy-to-use basic Linux iptables generator written on Java. It has some ready, very basic and general, rules that can be applied, or just displayed, and it gives you also the ability to create your own custom iptables rules.

PfPro is a "fat" client for managing configurations for PF-based firewalls. It is a graphical client-side application for managing multiple firewall configurations.

This program is intended to be used by Network Administrators. It is used to test connectivity on specific ports. THis program returns a simple pass or fail. Java 6 is required.

SOCKS Server and Library for Java. Support for versions 4 and 5 of SOCKS protocol. Designed to be easily expandable to support different encryption/authentication/authorization methods. Sample server and client are available.

Telnet over HTTP proxy. Allows users behind firewalls to tunnel Telnet sessions over a HTTP connection. Server uses Java servlets with a Java or C# client.

Reduce employee personal Internet usage during the working day. Increase respect of your corporate Internet usage policy, provide open and honest feedback such as WebMail use during work hours. Plugs into an existing proxy or firewall such as Squid.

BadTuxWall will help you to implement your own firewall on a Linux operating system using an efficient graphical user interface. It also allows you to generate iptables scripts, export them and share them with friends.

It moves by itself inside networks like virus infection & plagues, it is being written to solve computer virus problem drastically and responsibly. It is legal, free and open for public domain to improve W3 ICT Security.

CartoReso intends to facilitate enterprise computer network mapping.

The EmailWebBrowser allows users to request and receive web pages through email, even those that would be normally blocked by the user's network.

Server/client suite which provides per-user access control/firewall/QOS. Robust and high speed implementation is secure against MAC/IP spoofing, and can scale to large networks with many clients. Options for additional monitoring and captive portal.

This Library provides a java API for firewall logs, connection tracking and rules management.

IceIDS is heuristic Network Intrusion Detection System (NIDS) based on calculating Student's distributions of network traffic.

InSecT - Invincible Security Technology - an intelligent firewall and intrusion detection system

Infect is a network traffic classification tool, that classifies TCP protocols. The classification is based on ML techniques. Scen: Train/Recognize arbitrary protocols (SSH, HTTPS..), Detect policy violations (e.g. tunnels)