At the current time we are aware of the following libraries for developers seeking to add DNSSEC support to their applications:
C
- getDNS – a newer project to provide a more modern API for DNS
 - ldns from NLnet Labs
 - libval from the DNSSEC-Tools Project
 - libunbound, a component of the Unbound DNS resolver that can be used in other applications
 
Erlang
Go
Java
Perl
Python
- dnspython – available at dnspython.org and on Github
 - python-dnssec
 - PyUnbound – a python wrapper for the libunbound library (mentioned above under C)
 
Ruby
Do you know of additional developer libraries we should consider adding here? If so, please send them to us.