Free Analytics Tool For PayPal: AnalyzePal
It doesn't require any PayPal username-pass or API information as AnalyzePal works in an offline way with the transaction logs that can be downloaded from PayPal.
The application displays a snapshot of your last 3 months activities with charts or you can view the revenue for any given period.
AnalyzePal is also great for browsing past transactions quickly as it works offline.
Besides the free version, it has paid & more-featured versions that can filter data by customers, countries, etc.