  Simulation is one of the most powerful tools we have for evaluating the
performance of Opportunistic Networks. In this survey, we focus on available
tools and models, compare their performance and precision and experimentally
show the scalability of different simulators. We also perform a gap analysis of
state-of-the-art Opportunistic Network simulations and sketch out possible
further development and lines of research. This survey is targeted at students
starting work and research in this area while also serving as a valuable source
of information for experienced researchers.
