The KISSmetrics Node.js SDK by Gabriel Lesperance allows API interaction to implement data analytics into marketing applications. Resources include configuration, JSON package, and usage. Source code available at https://github.com/glesperance/node-kissmetrics/blob/master/lib/kissmetrics.js
Tynt, an innovative service that provides you more insight into how user engage with your web site content, now provides a Tynt API to access the analytics. The company and is expecting users to develop interesting mobile and web mashup applications with it.