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Distance and Bearing by N9YH
This program calculates distance, 6-digit Maidenhead Grid Square, and bearing (both directions) based on US city and state, zip code, latitude and longitude, and grid square.
System Requirements: Microsoft .NET 2.0 (get it here if you don't have it already). Linux and Mac users can use the Mono Project - it works, kind of. The grid square part is broken in Mono, but everything else works fine. We're trying to nail that down. To use this in Mono you'll need Windows Forms, which may not be installed on your distro. If you get an error about a missing assembly, try apt-get mono-winforms*.