Merge Duplicate Symbols is a Sketch.app plugin to merge symbols with the same name. Choose the one you want to keep and press OK. The other symbols will be removed, and all of their instances will be replaced by the one you chose to keep.
Flookup is a lightweight data cleaning suite for Google Sheets.
You can merge your data, highlight and remove duplicates or simply compare any two strings based on their level of percentage or sound similarity.
SheetTools is a set of 15+ smart features that you miss most in Google Sheets. Find duplicates, change text case, match and merge data, find specific data, split text, etc...