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CED2AR (pronounced as cedar), or the Comprehensive Extensible Data Documentation and Access Repository, is a lightweight DDI 2.5 repository. The project is funded by the National Science Foundation (NSF), under grant #1131848 and developed by the Cornell Node of the NSF Census Research Network (NCRN).

Developed by the Data Archive of GESIS, this tool imports SPSS data files; allows documentation of questions, sub-questions and answers; enables language-specific documentation; shows two languages concurrently on the screen; permits reuse of question documentation; exports into a DDI 2-compatible format, for Nesstar or long-term preservation; and exports into a DDI 3-compatible format, supporting enhanced publications.

Questasy is a web application developed to manage the documentation and dissemination of data and metadata for panel surveys. It manages questions and variables, including question reuse across multiple studies and longitudinal panels. It also manages concepts, publications, study information, and more. For administrators and project managers, Questasy provides an intuitive interface for managing the metadata. Questasy tracks downloads, and also easily integrates with web tracking applications (such as Google Analytics) to provide detailed statistics on site usage. For researchers, Questasy provides a fast, customizable, easy-to-use web interface for browsing and searching the metadata, and downloading the data. Researchers can also select the variables they are interested in and download a "custom basket" of variables, complete with a custom codebook for their selection. Codebooks are generated in both HTML for browsing and PDF for download/printing.

Nesstar Publisher is an advanced data management program. It consists of data and metadata conversion and editing tools, enabling the user to prepare these materials for publication and make such resources available to a wider audience. The program allows users to enhance datasets by combining a wide range of catalog and contextual information. Users are given, for example, complete control over the structure of the metadata within internationally recognized data documentation schema, including inserting Web links and URLs that can be viewed within the Nesstar Web client. Nesstar Publisher also allows merging of DDI documents containing markup for different sections of the DDI for the same study. This is especially useful for merging in variable description information generated from SPSS/SAS data definition statements or export files with study descriptions and question text.

Colectica Portal is a web application, powered by Colectica Repository, which enables data and metadata publication and discovery. License: Commercial

Colectica Repository is a centralized storage system for managing DDI data resources, enabling collaborative DDI-based workflows, and providing automatic version control.