The RAGE Software Portal: Toward a Serious Game Technologies Marketplace. - Wim Westera; Baltasar Fernández-Manjón; Rui Prada; Kam Star; Andrea Molinari; Dominic Heutelbeck; Paul A. Hollins; Rubén Riestra; Krassen Stefanov; Eric Kluijfhout (GALA, 2018)