1)   TSIG Key Generator 1.00
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.

 2)   Simple Failover 1.21
Keep your web shop open with Simple Failover. The concept really is simple.Iit continuously monitors your servers to find out which are up and which are down, and then it dynamically updates your DNS records accordingly.