OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.
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IPTraf is an ncurses-based IP LAN monitor which generates various network statistics including TCP info, UDP counts, ICMP and OSPF information, Ethernet load info, node stats, IP checksum errors, and more.
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Shield is an aggressive, modular firewall script for iptables which features easy configuration through a BSD-style configuration file, optional NAT support, TCP-wrapper-like functionality for service access, port forwarding, routable protection, DMZ support, and more.
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