OpenRefine is a free, open source power tool for working with messy data and improving it

Source website for openrefine.org

Example extension provided for demonstration purposes

An OpenRefine extension that helps with Wikimedia Commons editing: start projects from Wikimedia Commons categories; Commons-specific GREL functions.

Extension which lets you create an OpenRefine project from a SPARQL query

OpenRefine fork of the MIT Simile Butterfly server - our changes are on branch openrefine

Integration of Google Sheets and Google Drive in OpenRefine

Collection of containerized packages of OpenRefine

Geographic functions extension for OpenRefine: decToGMS() and geoDistance()

Files extension for OpenRefine