Spreadsheet
Tinderbox's new spreadsheet import is great if you keep a lot of information in a spreadsheet just because spreadsheets are good at making tables.
But, inevitably, we run into various edge cases where Tinderbox tried to do what you want, but doesn't quite understand. For example, Tinderbox looks at each column of your spreadsheet and tries to figure out which ones are numbers. Most of the time, that's easy: 42 is a number, and frabjous is not.
But is "192.168.0.1" a number? No: it's an IP address. And 3.6.2 is not a number; it's a version code.