vines draws vines (wandering plants made up mostly of stems and leaves) on your X11 or SunView screen. By default it draws in black and white, but color options (spring and fall) are provided. The vines can grow across the top of your screen and down the side, down from the top of your screen until they reach the bottom, or start from the center and wander all over the screen forever.
Snort is a network intrusion detection and prevention system. It is the most widely deployed technology of its kind in the world. It performs detection using a variety of methods including rules-based detection, anomaly detection, and heuristic analysis of network traffic. Its rules language is open source and available to the public as well.
HEYU provides a command line interface to communicate with the CM11A hardware module from X10. The CM11A will send remote control signals over the power lines to remote modules within your house. HEYU can be run from cron to automate lights, sprinklers, etc., or can store macros and timers in the CM11A memory for standalone operation. Auxiliary input is supported from MR26A, W800RF32A, and RFXCOM X10 RF receivers for X10, X10 Security, RFXSensor, RFXMeter, Oregon, and DigiMax RF signals (subject to the capabilities of the receiver). Arbitrary commands and scripts can be launched based on X10 and RF signals and the state of the system. HEYU also supports the CM17A "Firecracker" device for transmission of X10 RF signals.
The Simple Sockets Library makes sockets easy to use and comes as public domain source code. It resembles C's file I/O, uses whatever port is available, has named servers and port reuse, streaming/blocking sockets used, polling support, blocking/selection support via numerous functions, timeout control and firewall support.
Linux FreeS/WAN provides IPSEC (IP Security, which is both encryption and authentication) kernel extensions and an IKE (Internet Key Exchange, keying and encrypted routing daemon) as well as various rc scripts and documentation. It is known to interoperate with other IPSEC and IKE system already deployed by other vendors such as OpenBSD, Cisco, or CheckPoint. It also features Opportunistic Encryption, subnet extrusion, and with the appropriate patches interops nicely with Microsoft Windows XP/2000 using X.509 certificates.