TCPDump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture. It prints out a description of the contents of packets on a network interface that match the boolean expression. The Packet Capture library provides a high level interface to packet capture systems. All packets on the network, even those destined for other hosts, are accessible through this mechanism.   

TCPDump -  Network Packet Analyzer

Robust, Lightweight, Cross-platform, Template Software. STLSoft is a collection of STL and standard library extensions, and facades over operating-system and 3rd-party APIs.

STLSoft - C and C++ Libraries

pfSense is a powerful, flexible firewalling and routing platform. It includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution.
  pfSense is a stateful firewall, by default all rules are stateful. A Dynamic DNS client is included to allow you to register your public IP with a number of dynamic DNS service providers.

pfSense - Firewall and Routing platform

ScanSSH supports scanning a list of addresses and networks for open proxies, SSH protocol servers, Web and SMTP servers. Where possible ScanSSH, displays the version number of the running services. ScanSSH protocol scanner supports random selection of IP addresses from large network ranges and is useful for gathering statistics on the deployment of SSH protocol servers in a company or the Internet as whole. 

ScanSSH -  Scans the network for open proxies

Transport Layer Security (TLS) is a cryptographic protocol designed to provide communication security over the Internet. This is an open source Python implementation of TLS 1.2, using the Python Cryptographic Authority's (PyCA's) Cryptography libraries for all cryptographic primitives (e.g. AES, RSA, etc.). This project is part of PyCA's efforts to standardize and improve crypto libraries in Python.

TLS - Transport Layer Security protocol implementation in Python

m0n0wall is a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes. The entire system configuration is stored in one single XML text file to keep things transparent. It features include NAT/PAT, IPv6 support, SNMP agent, caching DNS forwarder, VPN tunnels and lot more.

m0n0wall - Embedded Firewall

Orchid is a Tor client implementation and library written in pure Java. Orchid will open a SOCKS5 listener which can be used as a standalone client where Tor would otherwise be used. It can also be used as a library by any application running on the JVM. 

Orchid - Tor client implementation and library written in pure Java

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Projects

TCPDump - Network Packet Analyzer

STLSoft - C and C++ Libraries

pfSense - Firewall and Routing platform

ScanSSH - Scans the network for open proxies

TLS - Transport Layer Security protocol implementation in Python

m0n0wall - Embedded Firewall

Orchid - Tor client implementation and library written in pure Java

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Projects

TCPDump - Network Packet Analyzer

STLSoft - C and C++ Libraries

pfSense - Firewall and Routing platform

ScanSSH - Scans the network for open proxies

TLS - Transport Layer Security protocol implementation in Python

m0n0wall - Embedded Firewall

Orchid - Tor client implementation and library written in pure Java

TechStack

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