Blaze is an open-source, high-performance 'C++' math library for dense and sparse arithmetic. 
    With its state-of-the-art Smart Expression Template implementation Blaze combines the elegance and 
    ease of use of a domain-specific language with HPC-grade performance, making it one of the most 
    intuitive and fastest 'C++' math libraries available. The 'RcppBlaze' package includes the header files 
    from the 'Blaze' library with disabling some functionalities related to link to the thread and system
    libraries which make 'RcppBlaze' be a header-only library. Therefore, users do not need to install 
    'Blaze'.

'Rcpp' access to the 'CCTZ' timezone library is provided. 'CCTZ' is
 a C++ library for translating between absolute and civil times using the rules
 of a time zone. The 'CCTZ' source code, released under the Apache 2.0 License,
 is included in this package. See <https://github.com/google/cctz> for more
 details.

Creates a header only package to link to the 'CGAL' 
  (Computational Geometry Algorithms Library)
  header files in 'Rcpp'. There are a variety of potential uses for 
  the software such as Hilbert sorting, K-D Tree nearest neighbors, 
  and convex hull algorithms. For more information about how to use the header files, 
  see the 'CGAL' documentation at <https://www.cgal.org>. Currently
  downloads version 6.1 of the 'CGAL' header files.

The 'RcppClassic' package provides a deprecated C++ library which
 facilitates the integration of R and C++. New projects should use the new 'Rcpp'
 'API' in the 'Rcpp' package.

The 'Rcpp' package contains a C++ library that facilitates the
 integration of R and C++ in various ways via a rich API. This API was
 preceded by an earlier version which has been deprecated since 2010 (but is
 still supported to provide backwards compatibility in the package
 'RcppClassic').  This package 'RcppClassicExamples' provides usage examples for
 the older, deprecated API. There is also a corresponding package
 'RcppExamples' with examples for the newer, current API which we
 strongly recommend as the basis for all new development.