An R package providing additional functions to cut, label and colour dendrogram clusters.
The recommendation is to install from CRAN.
install.packages("dendroextras")
You can use the devtools package to install the development version:
# install devtools if required.
if (!requireNamespace("devtools")) install.packages("devtools")
devtools::install_github("jefferis/dendroextras")
Note: Windows users need Rtools and devtools to install this way.