For material properties:
http://www.matweb.com/
plastics: Maizey Plastics
On CalculiX:
http://www.dhondt.de/
Solid models:
3D content central: http://www.3dcontentcentral.com
Grabcad: http://grabcad.com/
Creating high quality plots in Octave
Physics:
The Feynman Lectures on Physics, Volume I
Dynamics:
MIT OCW engineering dynamics
MIT OCW modeling dynamics and control
MIT OCW dynamics
Matlab & Math:
MathWorks
Science blogs to follow:
Empirical Zeal
The Loom
Not exactly rocket science
Projects to follow:
Open Hardware
