Expensive, but great to use! Full analysis packages reduce the error and accuracy risks associated with using a stand alone arc analysis tools. They also make it much easier to carryout analysis of installations with multiple sources of supply. They can allow you to switch feeds on and off in the software and carryout analysis of different running scenarios of the installation very quickly.
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Arcaware has use Power Tools for Windows extensively and can recommend it for easy of use and functionality. It excels in the reports section, where custom reports can be created to suit your needs. It is complex though and takes a while to learn.
EasyPower is a slightly simplier version from ESA. It does not contain the same level of reporting as PTW. Its simpler functionality makes it easier to learn and will not burn as big a hole in your funds either.