[RndTbl] DNS linters / consistency checkers?

[Adam Thompson]

Between roughly 10 and 20 years ago there was a bevy, nearly a plethora, 
of tools to scan your various BIND zone files and check that everything 
was in order, no illegal names existed, PTRs matched up with As, etc., 
etc.

Today I can only find two, one is dead (dlint) and doesn't check zone 
files only live DNS, and the other (validns) doesn't do PTR<-->A checks 
which is what I really wanted.

Where did all the other zone consistency-checking tools go?  Anyone have 
any pointers / links?

Thanks,
-Adam