With MetaModel, you use a type-safe SQL-like API for querying any datastore. It is a data access framework providing a common interface for exploration and querying of different types of datastores. It isn't a data mapping framework. Instead, it emphasizes abstraction of metadata and the ability to add data sources at runtime, making MetaModel great for generic data processing applications, but less so for applications modeled around a particular domain.
The Apache Open For Business Project is an enterprise automation software project that includes ERP, CRM, E-Business/E-Commerce, SCM, MRP, and CMMS/EAM functions. It is a foundation and starting point for enterprise solutions and can certainly be used out of the box, but is also great for creating specialized applications.
CollabNet Connector Framework is an Openadaptor-based SDK that allows rapid integrations and migrations dealing with the artifact data shared between different tools in the ALM cycle in combination with the collaborative platforms from CollabNet. It features bidirectional, out-of-the-box tracker integration between HP Quality Center, CollabNet SourceForge Enterprise, CollabNet Enterprise Edition, database tables, and CSV files.