Portkey is a port-knocking daemon. It allows you to put a simple combination lock on your TCP services and grant access to a port once a client has supplied the correct combination. The combination is supplied by attempting to connect to a specific sequence of closed TCP ports within a configured time period. Access is later revoked after a suitable timeout period.
Stealth (SSH-based Trust Enhancement Acquired through a Locally Trusted Host) is a file integrity scanner. It differs from a program like Tripwire in that it does not require the use of read-only media or modifiable logs. It leaves (almost) no trace on the computer being checked. It is very difficult for intruders to detect or evade, and cannot be modified by intruders. It can be used to perform integrity checks on many computers without a heavy maintenance burden. It can be used without being installed on the target computer.
X10MMS is a software suite that provides support for the X10 CM19A USB home automation transceiver under Linux. It allows users to control the device directly, sending and receiving basic on/off commands, and also includes a sample application that allows XMMS to be remotely controlled using the CM19A transceiver and an X10 palmpad remote. The current CM19A driver is implemented as a kernel module and requires an up-to-date 2.6.x kernel. The program is completely user configurable via a straightforward text file, so you can assign any supported function to any toggle key on the remote.