Powering more than 35% of managed DNS domains, CloudFlare runs one of the largest authoritative DNS networks in the world. Plus it’s totally free. PLUS it comes with an entire slew of performance and security features. CloudFlare’s global Anycast network powers our DNS and other services, serving 43 billion DNS queries per day, and growing. More …
Namecheap offers FreeDNS, their advanced DNS hosting service, for people whose registrars don’t provide DNS hosting with domain registration. Namecheap’s FreeDNS supports A/AAAA/CNAME/NS/MX//TXT/SRV DNS record types. It also provides DNS updates with DynamicDNS option. Email/URL forwarding and DynamicDNS are also included free of charge.
SmartDots offers several free domain names, each of which come with Full DNS management, 300MB of hosting space, no bandwidth limits, an email and an ftp account, along with full PHP + MySQL support with the hosting. This is as full-featured as it gets really.