Usage

DataNucleus is used by many companies and groups in their own software. Below are a short subset of those publicisable.

Google App Engine (TM) lets you run your web applications on Google's infrastructure. App Engine applications are easy to build, easy to maintain, and easy to scale as your traffic and data storage needs grow. With App Engine, there are no servers to maintain: You just upload your application, and it's ready to serve your users. AppEngine provides persistence using a DataNucleus plugin for their BigTable-based Datastore.
Salesforce.com and VMware introduce VMforce : the first enterprise cloud for Java developers. With VMforce, Java developers can build apps that are instantly social and available on mobile devices in real time. And it's all in the cloud, so there?s no hardware to manage and no software stack to install, patch, tune, or upgrade. Building Java apps on VMforce is easy!" i.e A cloud-based service and has a datastore that is not RDBMS. It provides JPA persistence using a plugin for DataNucleus.
Tivoli Security Policy Manager uses DataNucleus to work with the underlying database.
Yahoo! Inc uses DataNucleus in their systems
Roma allows you to develop enterprise level Java applications with low effort following a real Domain Driven Design approach. It's a new way to conceive the application: anything is a POJO, from the GUI forms to the persistent objects. Roma provides persistence using DataNucleus Access Platform
The Colibri Project (Hummingbird Project) is multi-platform Business Management Software, developed in Java, created through the use of the latest technologies and offers a range of very interesting capabilities. It is software that addresses the needs of the main shopping area of small and medium enterprises, making the control of purchases, sales, inventory and accounts. Colibri provides persistence using DataNucleus Access Platform
JFire is the new, powerful and free ERP, CRM, eBusiness and SCM /SRM solution for business enterprises. JFire is entirely free/open-source software, uses the latest technologies (J2EE 1.4, JDO 2.0, Eclipse RCP 3.3) and is designed to be highly customizable. JFire provides persistence using DataNucleus Access Platform
MetaMicro make use of DataNucleus persistence in their products
Travel Planning, Vacations and Travel Guides. Uses DataNucleus AccessPlatform in their website
Hewlett Packard uses DataNucleus AccessPlatform in their systems
General Electric uses DataNucleus AccessPlatform in their systems
Javelin : a high productivity yet lightweight development tool that allows software developers, analysts, consultants, mentors, educators to drive any Java development through a set of "live" class diagrams. It provides 'zero time' synchronized generation and management of code and the meta-data required for persisting your object model using DataNucleus.
Ridegtop Group use DataNucleus in their products
Apache Hive uses DataNucleus internally
Apache ISIS supports use of DataNucleus internally