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.
K.E.T.T.L.E (Kettle ETTL Environment) is a meta- data driven ETL (Extraction, Transformation, Transportation, and Loading) tool. This means that no code has to be written to perform complex data transformations. It is possible to create plugins to do custom transformations or access proprietary data sources. Kettle supports most databases on the market, and has native support for slowly changing dimensions on most database platforms.
Generating new objects for the Query Object Framework is repetitive, tedious, and time consuming. Qof Generator automates this process in PHP to build a working test program linked against QOF. Objects are created from an HTML form using a temporary MySQL cache and exported with Makefile, ./autogen.sh, ChangeLog, README, C source code, and doxygen mark-up comments in a tarball built by the PHP code.