WG7J's Grid Square Mapper - I can't say enough about this application. It now features dedicated FFMA Grid Square Mapping generated by your adif uploads. Each square will now display each callsign 'worked' and they're hypertext linked to QRZ and other sites of your choosing for QSL probability info!
Adif Log File Tools
Do you need to manipulate large or small amounts of log files or xfer between programs?
Contest LogChecker is a set of contest tools for Microsoft Windows, combining advanced text editing with keyword highlighted, and the ease and flexibility of import, export, statistics and charting utilities.