WEBENCH,
Jeff is correct; the Op Amp Gain and Zero Shift calculator called RESISTOR-CALC (a really bad name for such a powerful utility) is still down. If you key on www.ti.com/tool/resistor-calc you find a button for "View RESISTOR-CALC Input Screen" which is the interactive input screen that should be seen when we click on "Initiate RESISTOR-CALC". Instead the link takes you to the e2e Community screen. Surely wish you would find and restore the original RESISTOR-CALC link.
Thanks, Scott George