latest_news: Celery 3.0 released!on 7 Jun 2012, 6:17 p.m.
Celery is an asynchronous task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well.
The execution units, called tasks, are executed concurrently on a single or more worker servers using multiprocessing, Eventlet, or gevent. Tasks can execute asynchronously (in the background) or synchronously (wait until ready).
Celery is used in production systems to process millions of tasks a day.
Celery is easy to integrate with web frameworks, some of which even have integration packages.
Celery is written in Python, but the protocol can be implemented in any language. It can also operate with other languages using webhooks.