Motor sizing software won't do anything that a motion control engineer couldn't do by hand, but a little automation among an expert's tools surely couldn't hurt. Two of the vendor companies here will open up their catalogs freely to your specific application and show you best fits. The third company's sizing guide you'll have to purchase but you will, in turn, gain access to an expanded range of motor and drive options.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.