Download of kSpectra 3.9 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The most popular versions of the program are 3.3 and 3.2. This program's bundle is identified as com.spectraworks.kspectra2. We recommend checking the downloaded files with any free antivirus. KSpectra for Mac lies within Education Tools, more precisely Science. This Mac app was originally produced by SpectraWorks.
From the developer:
kSpectra Toolkit consists of a set of tools for advanced spectral analysis of time series in many sciences, ranging from finance and economics to geophysics and biomedical sciences.
Blackman-Tukey correlogram, the Maximum-Entropy Method, the Multi-Taper Method (MTM) and Singular-spectrum Analysis (SSA) are provided for spectral estimation.
You may want to check out more software for Mac, such as Gee, Arcade Math Blocks or NLVM, which might be related to kSpectra.