The document discusses software development kits (SDKs) for OpenStack. It notes that SDKs provide language bindings and wrappers that make it easier to integrate applications with OpenStack's API. It lists several popular OpenStack SDKs like jclouds, pkgcloud, and the python clients. The document encourages developers to use or contribute to OpenStack SDKs to help build applications on the cloud platform. It also outlines criteria for evaluating SDKs and opportunities for developers to get involved in the OpenStack community.