The tinydns and BIND exports are the most common. PowerDNS, NSD and Knot can all serve from BIND-style zone files. PowerDNS can also serve via a tinydns data.cdb file and a pipe-backend.

• Export to tinydns
• Export to BIND
• Export to PowerDNS
• Export to NSD
• Export to MaraDNS (new in 2013)
• Export to Knot DNS
• Export to BIND-nsupdate

Here are performance comparisons of different DNS servers:

• NSD4 performance measurements
• Knot DNS Benchmarks

DynECT support was added in 2014.

• DynECT

The NicTool project looks forward to supporting additional DNS service providers. Here's a couple links for comparisons of Managed DNS service providers.

• Comparison & Analysis of Managed DNS
• DNS reviews

Perl modules that implement each export class (for programmers)

tinydns, BIND, BIND-nsupdate, PowerDNS, NSD, MaraDNS, Knot DNS, DynECT