  Today, a paradigm shift is being observed in science, where the focus is
gradually shifting toward the cloud environments to obtain appropriate, robust
and affordable services to deal with Big Data challenges (Sharma et al. 2014,
2015a, 2015b). Cloud computing avoids any need to locally maintain the overly
scaled computing infrastructure that include not only dedicated space, but the
expensive hardware and software also. In this paper, we study the evolution of
as-a-Service modalities, stimulated by cloud computing, and explore the most
complete inventory of new members beyond traditional cloud computing stack.
