The Server SDKs allow you to quickly get up and running with the Vonage APIs in your language of choice.
Nexmo REST API client for Ruby
Nexmo REST API client for PHP
Nexmo REST API client for Python
You use the Nexmo Command Line Interface (CLI) to manage your Vonage account and use Vonage API products from the command line.
The Nexmo framework libraries can get you up and running with the Nexmo APIs quickly and easily in your framework of choice.