Ask HN: What are some of the best libraries out there for scraping reviews?

I'm looking to create a tool to pull in all our company reviews/comments in one place so we can respond to them... save us the time of cycling through a bunch of websites and knowing what we last read. I know I can google and I have - but I don't want to miss something that everyone is using to do this :) Thanks!

P.S. I'm language agnostic on this... I'll build a service out in whatever I need to.