Softwares

Here are some links to some open source software which i think will be useful to everyone

STEP - Physics Simulator
SALOME - a generic platform for Pre- and Post-Processing for numerical simulation
OpenFOAM - open source CFD software package
Discretizer - a free mesh program for CFD

FreeCAD - A parametric 3D CAD modeler

Scilab - Software for numeriucal computation

Processing -  programming language and environment for people who want to create images, animations and interactions

Blender - 3D content creation suite

CYCAS - CAD 2D + 3D + Architecture

Texmaker - LaTeX editor

GIMP - GNU Image Manipulation Program

LibreOffice - Alternative for Microsoft office

Netgen - Mesh Generator

enGrid - Opensource Mesh Generator
SciDAVis - Scientific Data Analysis and Visualization tool