Often, you want to detect changes on some eBay offerings or get notified of the latest items of interest from craigslist in your area. Or, you want to monitor updates on a website (your competitor’s, for example) where no RSS feed is available. How would you do it, by visiting it over and over again? No, now there are handy tools for website change monitoring. We’ve evaluated some tools and would like to recommend the most useful ones that will make your monitoring job easy. Those tools nicely complement the web scraping software, service and plugins.