in the code....
(checking to see if I can still post...
BINDv4 & v8 - From the Berkeley source
BINDv9 - Nominum developed
djbdns - Daniel J's contribution
Microsoft - Redmond code & varients
dents - who is this again?
ultradns - Hotz et.al.
all claim to have independently generated code bases.
Are there others?
URL's would be nice...
--bill