MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
TextSTAT - TextSTAT is a simple programme for the analysis of texts.
GNU Octave - GNU Octave is a programming language for scientific computing.
Antconc - The website of Laurence Anthony. Professor at Waseda University Japan, developer of AntConc, a freeware concordancer software program for Windows, Linux, and Macintosh OS X
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.
Voyant Tools - Voyant Tools is a web-based reading and analysis environment for digital texts.