pyFreeDnsUpdate is a command line python script that updates the FreeDNS record for a given domain to the current public facing IP address detected by the local host.
It requires a one time edit to configure a list of domain|api_key pairs, and after that it can be run as a chron job to perform a sync check and update push if needed.
Activity is logged on a local text file, and DEBUG level can be enabled in case of troubles.