BleachBit

Free space on your hard drive in the easiest way

PC Speed Maximizer

Give your computer more power, fixing the problems it may have

Argente Utilities

Complete utiltiy pack for your PC

O&O SafeErase

Manage to permanently remove any file from your computer

EnhanceMySe7en

Make the most of Windows 7

FCleaner

One of the best free PC maintenance programs available

TweakNow WinSecret

Powerful tool to optimize Windows

jv16 PowerTools

Optimize the performance and stability of Windows

MemInfo

Always know how much RAM memory your PC is using

Fix it Center

Detect and fix any Windows error

DTweak

Complete tool to optimize your computer

ASTRA32

Obtain information about your system with maximum accuracy

HDShredder

The best way to erase any file from your hard drive

Start-Q

Control all the processes that start with Windows

Eraser

Definitely erases a file from your computer

Argente Disk Cleaner

Remove unnecessary files from your PC

Statgraphics

Carry out statistical analyses on your data

Derive

Powerful tool for symbolic mathematic calculations

MathType

Complete mathematical equation and formula editor

Mathcad

Software for engineering calculations

Octave

Applied calculus software very similar to MATLAB

Maple

Solve complex mathematical operations

GeoGebra

Software to learn maths at all levels

Minitab

One of the best statistical calculation programs

MATLAB

Maths software tool for PC

IBM SPSS Statistics

Poweful software to collect and analyze statistical data

GeoEnZo

Digital board to teach and learn maths

WinPlot

Generate 2D and 3D graphics

PASW

One of the most powerful statistic solutions on the market

Mathematica

Platform for computational development

Microsoft Mathematics

Solve mathematical operations with this free tool