Easy way to use the 1-wire sensors like temperature, voltage and more.
OWFS -- 1-Wire file system. Use the Dallas 1-Wire and iButton chips with standard filesystem commands. Create temperature loggers. Monitor everything. OWHTTPD -- same system, only used as a light weight web server. OWFS is also ported to embedded routers, Mac OSX and Windows. Basically you can use these inexpensive little sensors and other chips with very simple wiring to sense and control the physical environment. The interface is very flexible -- everything from a web browser, to read and writing directly to the chip's "file" to integrating with your programs -- even over the internet. There is a growing number of 1-wire sensors: temperature, voltage, humidity, light, ultraviolet, pressure, thermisters, thermocouples, programmable microcontrollers, relays, lights, LCD panels, etc.
Linux GPIB Driver package (source)
The Linux GPIB Package is a support package for GPIB (IEEE 488.2) hardware. The package contains a development environment consisting of a GPIB library written in C, kernel driver modules, and bindings for several other languages.
Support for WiNRADiO radio receivers on Linux and other Unices.
RSMeter is a package for interfacing to the RadioShack/Metex 22-168A series of serial-connected multimeters. Currently, it includes an ncurses interface and a script to graph readings. Support for other meters is planned in the future, with an API.
Software to support TASS, The Amateur Sky Survey. We are taking photometric measurements of all stars in the sky in several filters measurements repeated frequently to allow detection of variable stars