Primcalc has gotten a major upgrade- you can now display model information in PrimCalc, to explain what the model is.  It's really just peeking at a JPEG, if present, next to the XML files for the models.  Currently working for the microstrip, stripline, and lumped element models.  I'll get the coplanar libraries added in the next couple of days. 

The next major upgrade I'm looking to add is a GUI to allow for manual tuning in Mason.  You'd get various optimization parameters as a tuning bar to tweak values and update the plots in real time.