The 8th release (https://launchpad.net/modelgui/+download) provides a number of improvements, notably to the data source interface. Minor fixes are also provided.

Changelog

Data Source Panel:

Improved PostgreSQL support
Functional Data Queries
XML persistence of data sources + queries

Windowing:

Adjustable split panels
Context menu options

Shapes:

Data operations (using GNU version of JEP)
Node selection tool
Improved mesh rendering