The DNS bot returns the NS, A and MX records. It also takes a peek at the SPF.
The DELegation bot checks the parent/chlid and child/parent relations of the NS records.
The SSL bot checks the presence and quality of the SSL certificate.
The WHOIS bot finds out the domain name registrar, as well as its creation and expiration dates.
The HTTP bot checks the response of the HTTP server. It also finds out the EFFECTIVE URL and PRIMARY IP.
The Website Status bot checks whether the wesbite associated with a domain name resolves or not.
The Domain Reputation bot shows how the average ISP ranks your domain.
The SYNC bot makes sure the name servers have proper synchronization.