iOS-style PageCapture app for OSx?
Paparazzi isn't a good app. I used it and it didn't work or was very slow to load.

I use a lot Layers Shot and W3Capture, they save the multiple pages or sites and also capture ones whole pages. Layers save as PDF, PNG, TIFF or PSD file. W3Capture, as PDF (separated pages) and PNG (one whole page). I also used a lot Web Slices (free), a sites sncreenshot app.

Go to the Mac App Store, search the apps and follow the apps:
(I can't pots more than two hyperlinks)
1) Layers Shot
2) Web Slices

Out of Mac App Store, W3Capture's link: http://www.bitsdujour.com/software/wcapture/

More apps that I didn't test yet:
Lightshot Screenshot (it's in Mac App Store and it is free)

I hope this answer help you. Good luck with these apps!