Download
First of all: FreeCAD is free software an comes with no warrenty!
FreeCAD Windows installer
For conviniance there is an installer for Windwos 200 & XP: http://prdownloads.sourceforge.net/free-cad/FreeCAD_0.5.285_setup.msi?download
FreeCAD debian binary package
For debian based Linux system here a binary debian package (Thanks to Werner Mayer): http://prdownloads.sourceforge.net/free-cad/freecad_0.5.258-1_i386.deb?download
FreeCAD Source package
For all other platforms you need to compile FreeCAD on you own out of the source packeage: http://prdownloads.sourceforge.net/free-cad/FreeCAD-0.5.258.src.tar.gz?download
FreeCAD LibPack
To collect all the needed Libraries to compile FreeCAD can be a time consuming task. So we deliver a convinient package for development on Windows (VS6 & VS8) with all needed libraries: http://prdownloads.sourceforge.net/free-cad/FreeCADLibs.zip?download