Google App Engine SDK is available for download in PHP, Python, Java, and Go languages after accepting user terms. Google App Engine, a platform as a service, allows to build apps in the cloud, useful to scale development projects. Available previous SDKs, Google Plugin for Eclipse, and mirrors of the open source of the SDK.
Salesforce has introduced a new Apex Metadata API for Force.com to help developers build self-configuring applications, upgrade scripts, and custom set-up user interfaces. The API allows applications to enable capabilities such as retrieve metadata synchronously and set up a callback on completion.