ACTING: A Platform for Cyber Ranges Federation. - Kyriakos Christou; Maria Michalopoulou; Stefano Taggi; Matteo Merialdo; Nikolai T. Stoianov; Vasilis Ieropoulos; Theofanis Eleftheriadis; Philippos Isaia; Eleni Darra; Ilias Koritsas; Antonis Voulgaridis; Giorgos Rizos; et al. (CoRR, 2026)