Signal Generator is a laboratory noise/sound generator which can be used to generate accurate sounds in fixed frequency, 2-channels (two frequencies going at once), a sweep-pattern, or in a specified sequence. It is useful when you need to generate a fixed sound for whatever purpose (in the laboratory, for sound effects, etc)
ibistools is a small set of command-line tools that aid a PCB designer working with IBIS models. It currently consists of a full IBIS v4.1 parser and an IBIS to SPICE translator. IBIS (I/O Buffer Information Specification) is a standard, human-readable, machine-readable format for publishing IC specifications.
Spice+ is a general-purpose circuit simulation program based directly on Spice3f5. Its main purpose is to allow university students and other interested people to simulate their circuits without buying expensive simulation programs or being limited by free trial versions of such software. Since source code is available, students or researchers can use it as a basis for new models and algorithms.