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.
Firebase, real-time backend for web application development, originally launched a little over a year ago. Since its launch, Firebase has remained in beta while it continued to improve its service and build a customer base. Over the past year, Firebase has added features, functionality, and thousands of customers. Accordingly, Firebase has announced it is leaving its beta stages behind and publically launching as a full-fledged paid product.