It's a large UML class diagram showing which technologies Metawidget can mix and match, and what configuration options are available. The wallchart includes all supported back-end technologies (shown in red), desktop frameworks (shown in green), web frameworks (shown in blue) and mobile frameworks (shown in yellow).
It's a great tool for both familiarising yourself with the overall architecture of Metawidget, and for exploring what plugins are available. It's downloadable as a PNG image designed to be printed across two pieces of landscape A3 or A4 paper. Click here to download it.