Is sampler available as a Maven Project?

In order to study sampler better, is a POM (maven 2) available for it somewhere?

Thanks in advance.

Unfortunately not - Maven is not the primary build tool for Vaadin, and the Sampler is in the main Vaadin project.
The simple color picker is the only “non-trivial” (own widgetset and theme) sample project available as directly via Maven, as the archetype vaadin-archetype-sample .

The full sampler sources are in the ZIP package on the
download page
as well as
in the Vaadin version control