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National Data Archive (NADA) is an open source data cataloging system that serves as a portal for researchers to browse, search, compare, apply for access, and download relevant census or survey information. It was originally developed to support the establishment of national survey data archives.
XSLT transformations for DDI XML-files to other formats
Big Life Lab Flow (BLLFlow) - a workflow for open, reproducible research. Includes support for PMML, DDI.
Tool to extract DDI metadata from SPSS and Stata