First of all, I want to take this opportunity to say that I'm glad I found DNSEver. It does everything I wanted it to do and more, and all free of charge. Keep up the great work, it is highly appreciated.
And now for the question. I'm aware of the instructions for updating my dynamic DNS hosts on Linux/Unix systems, but I'd like to use an existing client if possible. I am also thinking of writing my own client software if no compatible client exists. Does anyone know of an existing dynamic DNS client for Linux/Unix that is compatible with DNSEver? If not, I'll write my own and post it here.