FerFT is a multi-purpose spectral analyzer based on the successive Fourier transformation method. It features an input signal monitor which can sample input signals through a microphone with various sample rates and show them graphically on the panel. It also lets you calculate power spectra successively along with sampled input signals and show them graphically on the panel. Finally, it provides a filter to modify spectra and regenerate signals from them.
Salut is a small program that performs calculations on simple networks around two-port devices (like transistors) characterized by s-parameters, at radio frequencies (RF). It has the ability to model components in series with a two-port block, like an inductance from the common lead to ground. Salut is also not restricted to the usual common emitter or common source configuration even though many semiconductor manufacturers only provide s-parameters for this case.
Signs is a development environment for hardware designs in various hardware description languages. The tackled tasks are compilation, synthesis, simulation, and testing of designs. Due to the integration of these main areas, it provides the ability to debug designs in an all-embracing manner by switching between source code, netlist, and simulation. Supported languages include VHDL and the ISCAS benchmark format. Signs comes in two flavors: a command-line only version useful for processing and analyzing large netlists and as an Eclipse plugin for hardware design and simulation.