This article shows the main research results on diverse innovations in social engagement with the e-parliament. Our purpose was to map the best practices through Information and Communication Technology (ICT), which promotes the relationship between society and parliament, improving the parliament’s transparency, accountability, and responsiveness to citizens. For that, we used four analytical dimensions: political, technological, organizational, and social. According to these four dimensions, we have identified four types of Open e-Parliament engagement: 1) communication with citizens; 2) e-participation; 3) e-deliberation/e-consultation; and 4) collaboration. For each type, we described and explored some practices in order to generate insights for parliamentary institutional development, considering the Open E-Parliament dimensions.