It is much more convenient to use than the website (no need for the ugly select box country code), and you can easily set up aliases or another front end for it. Besides, it doesn’t need a big web browser so you it is also good to use over SSH. Furthermore, you can easily see the rates (which are setup charge; tariff; and billing interval for caller and callee, in €-¢t/10000) before even accepting the call.
To use it, you need a working Perl installation. Then just type
cpan followed by
install WebService::Nonoh. Obviously, the script might break when the website changes.
An older script was based on the script found on voip-info.org with added fee and error code output.
A small usage summary:
# check balance: nonoh SERVICE USER PASS # connect call nonoh SERVICE USER PASS FROM TO # send SMS nonoh SERVICE USER PASS FROM TO MESSAGE