Emdros "The data domain which Emdros handles is that of text. Emdros provides a certain abstraction of text that makes it ideally suited to storing and retrieving annotated text, such as linguistic analyses of a text.
These analyses can be, e.g., syntactic analyses, morphological analyses, or discourse analyses, or all of these. Phonological analyses are also supported to some extent.
Emdros is particularly useful in domains where research questions need to be asked of databases of annotated text. This would include dictionary-making, Biblical language-research (Greek or Hebrew), other linguistic research, and research on annotated text in general." The backend is either PostgreSQL or MySQL.