It depends on what kind of HR analytics you consider. What are the data sources, and HR systems? How many users will deal with it? What is your business goal? You can start with open source and then evaluate commercial platforms. Tableau is a very complex solution for heavy…
We use PDI for complicated data transformations.
We also use our tool ( www.metastudiodrm.com ) which is integrated with PDI to speed up complex parametrization of ETL jobs.