DNSimple is a hosted DNS Service Provider that you can use to manage your domains. They offer both a web interface and an iPhone application for adding and removing domains and DNS records as well as an HTTP API with various code libraries and tools. Rather than offering only DNS services, or focusing on domain registration without a focus on DNS, they unite both aspects of managing domains to provide a streamlined system for managing all of your domains.
CloudFlare is a powerful content delivery network. When you start using CloudFlare, your site becomes part of the CloudFlare network. This network routes your web site traffic through CloudFlare's global network of dataDNS Management Tools Cloudflare