HarvestMan is a fully functional, multithreaded webcrawler cum offline-browser. It is highly customizable and supports as much as 55 plus options for controlling and customizing offline browsing. It is written entirely in the Python programming language.
WebInspector is a websites watcher, a python console program that periodically checks a list of websites for changes and updates. If such an update is detected, selected by the user program (or programs) is executed. By default it's a web browser.