API Wrappers & Tools
By "wrapper", we mean a chunk of code (class, dll, etc.) that you will be able to download, drop into your project, and get going very quickly. These will handle the details of the actual network connections, parameters, and interface for you so that you can focus on just using the object(s) we expose to integrate MailChimp into your code.
Important: pay close attention to the version of the API the wrapper you are using supports! You may need to check older documentation or hack/update older libraries for your own needs
By Language / Platform
node-mailchimp exposes all functions of the MailChimp API, the MailChimp Export API and the STS API to your node.js application. Additionally it provides an easy way to set up Webhook endpoints.. Check it out here. Provided by Daniel Leinich.
A sample PHP script for collecting Webhook data. Check it out here. Provided by MailChimp.