S-Space is a free and open-source library that allows developers to design new distributional semantics algorithms and to build Semantic Spaces using a series of algorithms.
In other words, the S-Space package includes a collection of tools and a library for building semantic spaces.
S-Space is a cross-platform utility capable of running on any operating system that comes with Java support (e.g. Mac OS X, Windows, Linux).
Detailed instructions on how to install and use the S-Space utility on your Mac are available HERE.