The National Data Catalog aimed to be a complete catalog of all data sets and APIs that are either put out by the government or are derived from the government. Scoped to all government levels (federal, state, and local), and all branches (executive, legislative, judicial), NDC aimed be the one-stop shop for developers, researchers, and investigative journalists interested in government data.
The Sunlight Foundation has shut down the site, but all of the site's code can be found on their GitHub page here.
