Three years back I had written a small tool to help QA software engineers to speed up their work.
The Test helper tool had the below simple but very useful functions:
Count the number of characters entered.This feature was very help full in case you want to test an application which accepts limited number of characters. i.e fields with max characters test.
Comparing two text input fields.Useful when wanted to test register user screens, reset password screens etc.
UTC conversionIf you are working on a time zone sensitive application, you need to store the date time fields in the utc zone. But remembering and calculating the time in different GMT +- will impede testing activity. This function of the Test helper is very beneficial in such instances.