Scrapbot is a project mainly written in Ruby, it's free.
= Scrapbot
== Introduction
Bot which can watch give urls and copy them on your computer if detect any changes
== Instalation
On rubygems is old version of this gem so you should build it your self
git clone git://github.com/Lewy/scrapbot.git
rake build
rake install
gem install scrapbot
== Usage
I put example configuration file in example folder
scrapbot watch --url_file=urls.txt --conf_file=conf.yml