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# App Engine Features

This page all of the App Engine features and their availability.

- SDK Release Notes
- Roadmap Features
- Trusted Tester Features
- Experimental Features
- Production Features

Trusted Tester and Experimental features are not considered stable, they may be changed in backward incompatible ways, and may be deprecated at Google's discretion.

## SDK Release Notes

- Python SDK release notes
- Java SDK release notes
- Go SDK release notes

## Roadmap Features

Roadmap features are actively under development by the App Engine Team. Most of these features here are intended to be launched within the following six months:

- Outbound sockets support
- Java Servlet 3.0 support
- Mapreduce API (Java)
- Blobstore migration tool

## Trusted Tester Features

Trusted tester features are limited to a closed group of testers and require you to sign up in advance in order to use the feature.

- Cloud SQL
- Java threads support
- Full Text Search API
- Monitoring API
- SSL for Custom Domains

## Experimental Features

Experimental Features are available to everyone but are new and often rapidly changing features. They are not yet considered stable and so should not be used if reliability is important. They might change (including backwards-incompatible changes). Experimental features typically become full Production features but sometimes are removed completely.

- Task Queue Tagging
- Traffic Splitting
- New Database Module (NDB)
- Datastore backup and restore in the Administration Console
- Go Runtime
- Conversion API (Python, Java)
- Google Cloud Storage API (Python)
- Files API (Python, Java, Go)
- Mapreduce API (Python)
- Prospective Search API (Python, Java)
- ProtoRPC API (Python)
- Task Queue REST API (Python, Java)
- OAuth API (Python, Java)
- OpenID (Python, Java)
- App Identity API (Python, Java)
- Datastore Admin

## Production Features

The following features and APIs are generally available and considered stable.

- Backends (Python, Java)
- Blobstore API (Python, Java, Go)
- Capabilities API (Python, Java, Go)
- Channel API (Python, Java, Go)
- Datastore API (Python, Java, Go)
- Datastore Async API (Python, Java)
- XG Transactions (Python, Java)
- HRD Migration Tool
- Images API (Python, Java)
- Java Runtime
- Log Service API (Python)
- Mail API (Python, Java, Go)
- Memcache API (Python, Java, Go)
- Multitenancy API (Python, Java)
- Python 2.5 Runtime
- Python 2.7 Runtime
- Remote API (Python, Java)
- Task Queue API (Python, Java, Go)
- URLFetch API (Python, Java, Go)
- Users API (Python, Java, Go)
- XMPP API (Python, Java)