  KCDC, the 'KASCADE Cosmic-ray Data Centre', is a web-based interface where
initially the scientific data from the completed air-shower experiment
KASCADE-Grande was made available for the astroparticle community as well as
for the interested public. Over the past 7 years, we have continuously extended
the data shop with various releases and increased both the number of detector
components from the KASCADE-Grande experiment and the data sets and
corresponding simulations. With the latest releases we added a new and
independent data shop for a specific KASCADE-Grande event selection and by that
created the technology for integrating further data shops and data of other
experiments, like the data of the air-shower experiment MAKET-ANI in Armenia.
In addition, we made available educational examples how to use the data, more
than 100 cosmic ray energy spectra from various experiments, and recently
attached a public server with access to Jupyter notebooks. In this paper we
present a brief history of KCDC, the main features of the recent release as
well as will discuss future development plans.
