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TenLinks.com - Directory of CAD, CAM and CAE

TenLinks Sites
CADdigest
articles, reviews, tips
FreeCAD
free CAD programs
CADtalent
CAD job board
CAD Insider
blog by Roopinder
 

Mathematics

Math Software
Maplesoft, Mathematica, MATLAB, PTC Mathcad

Free Math Stuff

Online Math Solvers
Martindale's, Measure4Measure, QuickMath, Symbolab, WebMath

Units 
Google, A Dictionary of Units, Unit Converters.net, How Many?