You could have downloaded MetaModel 2.2 for Mac from our software library for free. The actual developer of this free Mac application is Metamodel. The bundle identifier for this app is net.andrometa.MetaModel. The MetaModel installer is commonly called MetaModel-2.2.zip. The following version: 2.2 was the most frequently downloaded one by the program users. The software lies within Developer Tools, more precisely DB Tools.
From the developer:
MetaModel is a library that encapsulates the differences and enhances the capabilities of different datastores. Rich querying abilities are offered to datastores that do not otherwise support advanced querying and a unified view of the datastore structure is offered through a single model of the schemas, tables, columns and relationships.
You may want to check out more Mac applications, such as UML Designer, which might be similar to MetaModel.