Is It Down Right Now? - Network & Admin
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Site Down - Site down outage and downtime reports from SiteDown.co
StatusGator - Monitor all your hosted applications, vendors, and websites, and keep your team informed of outages. StatusGator is the world's premier status aggregator, status page, and website monitoring tool.
IsThisSiteDown.org - Free tool to check whether a site is down just for you, or for everyone.
WrapAPI - Build an API on top of any website