Unlike a number of Google's tools, using this one doesn't mean putting your data in the hands of Google, so there's no worries about using this tool to work with sensitive data.
Named for "panel data", pandas is a Python library with tools and data structures for working with tabular data. (Also matrix, statistics, time series, etc.) Jupyter has good support for displaying pandas data frames.
PowerQuery adds functionality to pull and cleanse data from a variety of sources into your spreadsheet, remembering the source and cleansing workflow steps to allow the data in the sheet to be refreshed should the source data change.
http://www.microsoft.com/en-gb/download/details.aspx?id=39379