Unlock - Monetize your content with a few lines of code
Dnsstuff - DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering.
HitPay - Send or receive money using a modern payments interface
MxToolBox - All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
Kale - Kale helps nanoinfluencers (<10k followers) make a passive income.
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.