ReGenesees 
ReGenesees (R Evolved Generalized Software for Sampling Estimates and Errors in Surveys) is an R package for design-based and model-assisted analysis of complex sample surveys.
ReGenesees is the standard tool for calibration, estimation and sampling error assessment at Istat (the Italian National Institute of Statistics).
Installation
You can install the development version of ReGenesees from GitHub as follows:
install.packages("devtools")
devtools::install_github("DiegoZardetto/ReGenesees")The last released version of ReGenesees can be downloaded from Istat website or from the European Commission platform Joinup (where older versions are available too).
Website
A pkgdown website for ReGenesees is available here:
Graphical User Interface
A companion R package named ReGenesees.GUI is also available, which provides a user-friendly mouse-click graphical interface for ReGenesees. Find it e.g. on GitHub here: