WREC controls an SCPI-programmable power supply (such as Agilent E3631A) to reform large aluminum electrolytic capacitors. It was written specifically for the Computer History Museum PDP-1 Restoration Project, but should be useful for reforming capacitors for almost any old equipment, even audio gear.
libmls is a library that can be used to measure the frequency response of a loudspeaker or a room using your computer and an ordinary soundcard. It can perform both MLS (Maximum Length Sequence) and Sinus sweep measurements. It supports ALSA, OSS, and the sound system used in Windows.
JCCad is a project to develop a 2D/3D CAD program that can be used to create technical drawings. One of the main goals of this project is to include a plugin system to allow usuaries to make new commands. In this way it will be easy to use the program for any particular task. JCCad provides an easy interface with a command line.
nMicrocoder is an ncurses EDA tool to write microcode. Basically, it is a stripped down spreadsheet program that lets you fill a table with "0", "1", and "-", and gives you compile-ready verilog code in return. It was written as an alternative to full spreadsheet programs. It is known to run on Linux, IRIX, and Solaris, unless ncurses 5.3 is installed.
To allow for identification, resistors are usually marked with colored bands. Often referred to as color codes, these markings are indicative of their resistance, tolerance, and temperature coefficient. gResistror is a great program that will help you translate resistor color codes into a readable value. All you have to do is watch the colors on the resistor and then enter them in the program. As you enter, you'll see that the resistor value is changing according to the selected color.