AFDIM
TypeAFDIMat the command line
Automatic dimensioning for part drawings in AutoCAD® and AutoCAD® Mechanical.
from US$19 excl. taxDetails
Products
Plugins for AutoCAD®, written in C# on .NET and running on the drawing already open in your session. AutoCAD LT has no .NET API, so none of them load in LT.
Paid
Other tools are listed here only once they are released. Nothing on this site announces a date it does not have.
Start with a drawing you already know
Install it, start the 7-day trial, run it on a part you have dimensioned by hand before, and compare.