DynSite 

DynSite automatically updates your dynamic IP address each time it changes on one or many dynamic DNS or by email. This allows anyone to connect to the servers running on your own computer using a fully qualified domain name.
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DnsLibrary 

The DNS Library is a COM component that makes dynamic DNS updates to RFC-2136-compatible DNS servers possible from any scripting languages in an easy way. For secure updates, HMAC-MD5 and GSS-TSIG are supported.
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TSIG Key Generator 

This tool can generate a TSIG key value (base64) very easily. TSIG is a secure method of authenticating clients making dynamic DNS update requests. The key value generation functionality is already built into Simple DNS Plus and Simple Failover.
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cryptlib 

Security toolkit with strong encryption and authentication. Supports many algorithms for symmetric/asymmetric encryption, authentication, and hashing. Free for non-commercial/shareware projects. Written in C. ActiveX and C++ wrappers are available.
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