Quandl has indexed over 5 million time-series datasets from over 400 sources. All of Quandl's datasets are open and free. You can download any Quandl dataset in any format that you want. You can also visualize, save, share, authenticate, validate, upload, index, merge and transform data. Our long-term goal is to make all the numerical data on the internet easy to find and easy to use.Establishing a Quandl user account is free and easy. I tested downloading Quandl datasets using the Excel add-in and R package accessories readily available for download from the Quandl website -- both worked perfectly.
Quandl has arrived...