Mighty Merge is a spawn of a project created over a decade ago for merging and joining CSV files from within a terminal. Its greatest feature, beyond speed, was in the ability to organize, fill and patch mismatched columns of all files into a clean and final CSV output.
Expanding from this project, gave way to a new phase of development and was ported into the web as Mighty Merge (legacy). The legacy version of Mighty Merge is the prototype to what Mighty Merge is to become.
Today, the tool does much more than just merge multiple CSV files together. It is now a full-fledged embedable CSV Importer with rules, validations and all.
Hope you enjoy!