Data on WikiRate is under creative commons licenses and is downloadable from a project, metric or company profile. From a metric, company or project page, scroll to the bottom of the page to find the text Export: csv / json, and click the preferred file type. Another way is to add ".csv" to the end of the URL (e.g. http://wikirate.org/Amnesty_International+Conflict_Minerals_Policy.csv) this will export a .csv file containing all of the data associated with the metrics and companies on that page.
Please note that this feature is relatively new, and in continued development - your feedback is welcome.