  OPUS (Observatoire de Paris UWS System) is a job control system that aims at
facilitating the access to analysis and simulation codes through an
interoperable interface. The Universal Worker System pattern v1.1 (UWS) as
defined by the International Virtual Observatory Alliance (IVOA) is implemented
as a REST service to control the asynchronous execution of a job on a work
cluster. OPUS also follows the recent IVOA Provenance Data Model recommendation
to capture and expose the provenance information of jobs and results. By
following well defined standards, the tool is interoperable and jobs can be run
either through a web interface, or a script, and can be integrated to existing
web platforms. Current instances are used in production by several projects at
the Observatoire de Paris (CTA/H.E.S.S, MASER, CompOSE).
