Development
assertthat: Easy pre and post assertions.
checkr: Automatically Test R Functions
covr: Test Coverage for Packages
ctv: CRAN Task Views
devtools: Tools to make developing R code easier
evaluate: Parsing and Evaluation Tools that Provide More Details than the Default
fuzzr: Fuzz-Test R Functions
lazyeval: Lazy (Non-Standard) Evaluation
microbenchmark: Accurate Timing Functions
packrat: A Dependency Management System for Projects and their R Package Dependencies
parallel
pkgdown: Make Static HTML Documentation for a Package
profvis: Visualize profiling data
profr: An alternative display for profiling information
pryr: Tools for Computing on the Language
R6: Classes with Reference Semantics
rbenchmark: Benchmarking routine for R
rjsonapi: Consumer for APIs that Follow the 'JSONAPI' Specification
rstudioapi: Safely Access the RStudio API
testthat: Unit Testing for R
testwhat: Easily write submission correctness tests for R exercises
tools: Tools for Package Development
withr: Run Code 'With' Temporarily Modified Global State