All the stuff you don’t really want to know but if your network, server or web site doesn’t work you have to know.
- www.Ausregistry.com.au/tools/recover-password – who owns what domain
- LeafDNS.com – DNS testing
- Spyonweb.com – Domains on similar IPs or with similar Google Analytics or Adsense Publisher references
- MXToolbox.com – Mailserver testing
- WebPageTest.org – cry over how slow your web page are or rejoice at hoe lightning fast they are.
- Emailonacid – responsive email testing on mobile and desktop clients
More a marketing tool
- Similarweb.com – Amazing traffic statistics on competing or similar web sites