Are My Sites Up? - Simple, easy website uptime and downtime monitoring
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from Diigo
Web Informer
URL Dogg - Domain Analysis
Web framework site software CMS detection tool -- guess
Is a site up or down? | Up or Down
Scrapy | A Fast and Powerful Scraping and Web Crawling Framework
Discover Who Hosts Any Website | Who Is Hosting This
Readable | Free Readability Test Tool