"As a priority Open Government Initiative for President Obama's administration, Data.gov increases the ability of the public to easily find, download, and use datasets that are generated and held by the Federal Government. Data.gov provides descriptions of the Federal datasets (metadata), information about how to access the datasets, and tools that leverage government datasets. The data catalogs will continue to grow as datasets are added. Federal, Executive Branch data are included in the first version of Data.gov."
"The World Bank's Open Data initiative is intended to provide all users with access to World Bank data. The data catalog is a listing of available World Bank data sources. This listing will continue to be updated as additional data resources are added. These resources include databases, pre-formatted tables and reports. Each of the listings includes a description of the data source and a direct link to that source. Where possible, the databases are linked directly to a selection screen to allow users to select the countries, indicators, and years they would like to search. Those search results can be exported in different formats. Users can also choose to download the entire database directly from the catalog."
"Transparency Data is a central source for all federal and state campaign contributions made in the last twenty years. Here you can begin your search, find the information you need and then download records of what a candidate has received, what an individual has given, and how much companies and their employees have given."