From Steffen Heldt:
Do you know this situation? You want to enter a value into an electronic form but the form requires it in another unit than you have in mind. For you this means to open a unit converter, select the given and desired unit, enter the value and copy and paste the result. With Unit Scout it is so much easier. Only enter the value plus unit into the form's text field, add the shift operator ">>" and the desired unit. A key logger working silently in the background understands your request, deletes your input and sends the result into the text field. Your are done without toggling through your various windows. .
Features: Unit Scout understands calculations stated in terms of unit expressions (such as "100psi*ft^2") and converts them into SI units per default or every other unit specified by the user. No user interface is required. The program can be controlled from everywhere - editor, browser, spreadsheet, etc. Unit Scout is customizable with user defined units simply stored in a CSV file. Conversion requests and results are logged in a diary file. Unit Scout is free of charge.