NLnet Labs
Unbound
FreeValidate secure DNS and stub-resolvers with recursive caching.
Windows
NSD for Linux
FreeGet an open source name server for your Linux system.
LinuxAutotrust for Linux
FreeGet a commandline tool to automatically update your DNSSEC trust anchors.
LinuxUnbound for Linux
FreeGet a validating recursive caching resolver.
LinuxDNS Analyzer for Linux
FreeAnalyze DNS traffic from tcpdump or libpcap trace files.
Linux
Dnssec-Trigger
FreeConfigure your local unbound secure server.
WindowsLDNS for Linux
FreeSimplify DNS programming on your Linux system.
Linux
Unbound Portable
FreeValidate secure DNS and stub-resolvers with recursive caching.
Windows