FE Analysis & Design:
RFEM
Manual Calculations:
Calculate in Word Add-in
Anchors:
Fischer
Hilti Profi
PDF
PDF Exchange
Drafting:
Sketchup
Layout (Trimble)
I do my math in Word (Calculate in Word Add-in), so I don't have to copy and past the math. Output from other programs, like RFEM I do have to copy and paste.
For me it's really important to have an efficient workflow. The copying and pasting of the Mathcad results into my Word document is to much of a hassle.