Octave

Applied calculus software very similar to MATLAB

Scilab

The most comprehensive tool to perform numerical calculations

GeoEnZo

Digital board to teach and learn maths

Euler Mathematical Toolbox

Complete numerical and algebraic computation system

Mathcad

Software for engineering calculations

WinPlot

Generate 2D and 3D graphics

Microsoft Mathematics

Solve mathematical operations with this free tool

Graphing Calculator 3D

Draw any 2D or 3D function almost instantly

Geometry

Complete trigonometry and geometry calculations easily

Derive

Powerful tool for symbolic mathematic calculations

Mathematica

Platform for computational development

MathType

Complete mathematical equation and formula editor

Maple

Solve complex mathematical operations

Gretl

Application for econometric analyses

Statgraphics

Carry out statistical analyses on your data

PASW

One of the most powerful statistic solutions on the market

Sonic Visualiser

Inspect the contents of your audio files

BestPractice

Change the tempo and tone of any song in real time

Acoustica

Edit your audio files with dozens of different tools

Sofonesia MP3 Clipper and Joiner

Simple tool to cut and join MP3 files

Skype Voice Changer

Disguise your voice when using Skype

PolderbitS Sound Recorder and Editor

Two practical and lightweight audio tools

Kangas Sound Editor

Create your own music from scratch

mp3DirectCut

A simple and efficient MP3 file editor

Music Editor Free

Complete music editor that offers professional results

Voicemeeter

Audio mixer that allows you to change your voice

ACID Xpress

The free version of one of the best sound editors around

WaveMax Audio Editor

Complete and appealing audio editor

MP3 Workshop

Work with your MP3 files

AudioQuick Editor

Quickly learn to edit your audio files

Mp3Doctor

Enhance the sound of your audio files