Netcat with encryption for Linux and Windows - This is the classic network utility Netcat, with Twofish encryption. Includes Windows and Linux source and binary. To make it secure you need to change the hardcoded key.
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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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floppyfw is a router and simple packet filtering firewall on one single floppy. It uses Linux ipchains firewall capabilities and includes a simple packaging system. It is perfect for masquerading and securing networks on ADSL and cable lines using both static IP and DHCP. It is simple to install, you only need to edit one file on the floppy.
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closefd v1.1.3-ok is a kernel module which closes a file of any process for Linux 2.2.x. It works on regular files, sockets, directories, pipes, etc.
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