Developer website: BeerSmith LLC
In addition to recipe tools and such standards as hydrometer correction and alcohol calculators, BeerSmith includes extras, such as dilution calculation, hop aging adjustments, yeast starter calculation, a brewing schedule planner, inventory/shopping lists, cost calculation and much more. It also handles BeerXML files for exchanging recipes with other software. A tabbed user interface helps manage the myriad of details involved.
BeerSmith is priced at $27.95 for use on two of your computers (e.g. desktop and laptop), and the download runs free for 21 days for a trial period.