GCTool is already a few years a famous tool under Dutch cachers, now it has been made available in English. GCTool is a tool which helps geocachers doing projections, transformations, fast text and digit analysis. It's freely available for download at:
http://www.gctool.net
Most important features are...:
Screenshot:
I hope you'll enjoy it like the Dutch do, I'm always open to implement your feature requests!