This is my 300th post!! I have really enjoyed doing this - sharing resources with other educators. Thanks for all of the encouragement and feedback!
This post is a listing of some free online calculators. I have used them all and really find them to be great resources for teachers and students.
Here is a list of 6 that I've used and like. The first one is my favorite.
MotionNet Engineering Directory Calculator (also has other resources on it).
Do you have any others? Any free downloadable Scientific Calculators?