Quartz is in use by many thousands of entities, many of whom have directly embedded Quartz in their own custom
applications, and others who are using products that already have Quartz embedded within them.
Quartz 1.6.0 was directly downloaded more than 100,000 times, and countless additional times through secondary
repositories (such as ibiblio.org).
Here is a list of just a few of the thousands of Quartz users:
Vodafone Ireland - uses Quartz for scheduling tests to be carried out on systems in order to generate quality of service information.
Covalent Technologies, Inc. - uses Quartz within their CAM product to handle anything scheduling related in the system, such as: scheduling server actions (start, restart, etc.), metric calculations, data cleanup daemons, etc.
Partnet Inc. - uses Quartz for scheduling application events and driving workflows within many of its products. Partnet has been a contributor to the Quartz code base in years past.
U.S. Department of Defense - uses Quartz at various points within a large electronic commerce application, notably order fulfillment.
Level3 Communications - uses Quartz to drive software builds and deployments.
Atlassian - uses Quartz within several of their excellent products, such as JIRA and Confluence.
Cisco - uses Quartz in various in-house systems.
Apache Jakarta - Quartz is used within (or as plugins to) several products falling under the Jakarta umbrella.
OpenSymphony - Uses Quartz to drive the OS Workflow product.
Spring - Quartz is used within the Spring Framework.
XpoLog - uses Quartz within XpoLog Center in order to enable automatic technical support.
Bloombase Technologies - has integrating Quartz within their Spitfire EAI Server for XML security processing.
Thomson Tax and Accounting - uses Quartz in its job scheduling framework within it's editorial systems group.
The Liferay Portal - is using the Quartz Scheduler. Just download and check the code. Liferay Inc. Portal.
Infoglue CMS - from infoglue.org
Apache Cocoon - uses Quartz to provide scheduling features and to run application background processes.
JBoss - uses Quartz for the implementation of a number of services within its infrastructure.
Adobe - uses Quartz for scheduling database operations in their LiveCycle Enterprise Suite.
Icebergsofts - uses Quartz for job scheduling in iceQA 2009.
Cypress Care Inc. - uses Quartz for all Insurance-related Job Scheduling for the organization
OpenReports - (http://oreports.com) - an open source web reporting application uses Quartz to schedule reports.
Apache Synapse - uses Quartz to add Job Scheduling to the Apache Synapse ESB. It is also being "inherited" by the WSO2 ESB which is another Open Source project that packages Apache Synapse.
Sun's OpenESB community - uses Quartz for the Scheduler component in the ESB that can be used in conjunction with a growing list of 40+ components such as RSS, FTP, SAP, CORBA, scripting engines, event processing, business process orchestration, etc.
Caucho - uses Quartz to power the scheduling features within their Resin Java EE 6 Web Profile implementation.
Adeptia - uses Quartz to provide scheduling and job management features within its Adeptia Suite line of ETL, Integration and Business Process Management products.