I'm looking for something that will generate scatter plots comparing different properties of isotopes. Ideally I'd like some web page that lets me select axis and click go but a CSV file with lost of properties would work.
Exploring the Table of Isotopes is my go-to site.
There are a few others out there, but when I moved from my last computer those were some of the bookmarks I didn't bring, 'cause I never used them...
You haven't specified what you want in your CVS file. I think this site only offers transition energies and branching fractions by radiation type.
For searching a whole database of transistions for lines of [energy range]$\times$[A or Z range]$\times$[halflife range] use The Lund/LBNL Nuclear Data Search. Very useful if you are thinking of building a novel calibration source or some thing like that. This site also has stopping powers and other good stuff (go up a level from the link...). Another go-to resource.