TADNS is small, portable asynchronous DNS lookup library written in ANSI C. Works on Windows and UNIX. Extremely simple and clean API. The source code resides in single .c file.
IncrediBL is a project that aims to provide a respected and accountable DNSBL service for various communication systems like IRC and e-mail. The code is primarily used by the IncrediBL service itself, but it can also be used to create a separate DNSBL.
Open domains is OPen Source Code, it will help you become a free domain name provider. You can create any subdomain redirect with opendomains. Build in Php4/Mysql4 . You can run it in Linux / Windows Hosting. Easy to install and create Short Domain Name
C# DNS Client Library (100% managed code). Query domains to get MX records, CNAME and Address resource records from your application. All common DNS query types supported. Supports user-defined servers.
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This project is an extension of the OpenSRS client code distributed by Tucows. Many additional features and enhancements have been added, making it easier to configure, extend and implement.