I've written a few tools for Amateur Radio operators. I decided to put them all in one place for easy access.

ADIF County Conversion
ADIF to CSV (spreadsheet)
ADIF to CQ DX Marathon
Analyze Contest Passing
Cabrillo to CT
Contest Club Score
CT to ADIF
ARRL NPOTA Single-Page Spreadsheet
Split ADIF Log by Transmitted QTH
W1AW Centennial QSOs to Spreadsheet