  Reactive graphs are transition structures whereas edges become active and
inactive during its evolution, that were introduced by Dov Gabbay from a
mathematical's perspective. This paper presents Marge
(https://fm-dcc.github.io/MARGe), a web-based tool to visualise and analyse
reactive graphs enriched with labels. Marge animates the operational semantics
of reactive graphs and offers different graphical views to provide insights
over concrete systems. We motivate the applicability of reactive graphs for
adaptive systems and for featured transition systems, using Marge to tighten
the gap between the existing theoretical models and their usage to analyse
concrete systems.
