Is there any good software for notifying you about domain name server changes, both free and paid.
Thanks

Godaddy DomainAlert Pro can help you.

How does it compare with the free Domain tools service?

i think there are many other sites offer service free. Just google it.

There are many services, but I want to know which one is reliable. Yesterday, I had changed my name server, but even after 24 hours , domain tools is showing the same old name server data.