Take a look at Keywording made easy
I designed and built it as a cheap and easy keywording aid

Main Features
·         Runs on any major browser so it is system independent
·         Removes duplicate words and phrases
·         Drag and drop sorting – drag important words to the beginning
·         Will display spelling mistakes and typos (using the browser’s spell checker)
·         Easy addition and deletion of words and phrases
·         Copy to clipboard (with commas) ready to paste into the image with the tool of your choice
·         Character counter and phrase counter

Take a look at https://sellfy.com/p/P2Di/ for more information