R Package Name Brief Description
tree This package is the primary implementation of CARTs in R.
The package implements both classification and regression tree models.
https://cran.r-project.org/web/packages/tree/tree.pdf
rpart Recursive partitioning tree-based models for classification, regression and survival applications
that implements most of the functionality discussed in the earlier works of Breiman et al. (1984).
Tends to be faster than the tree package.
https://cran.r-project.org/web/packages/rpart/rpart.pdf