From SweetScape: Hamic , the HAM Intelligent Calculator, is a program designed to simplify a number of calculations commonly used by HAMs or other people interested in antennas or electronics. HAMIC has a simple to use, but powerful graphical interface that allows solving simple circuits such as resistors in series or parallel, or more complex circuits such as L networks or T networks. As well, other calculations such as SWR and reactance conversions are supported. One of the most powerful features of HAMIC is to solve for almost any unknown variable in a circuit (including L networks) and HAMIC can also convert between a number of different units with ease.
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