Comment by YWall39

most are specialised in my field. for the more general, I cannot work without dynlm and plm. Just last week I needed to compare the empirical distribution of something to a known reference, with either the empirical or QQ, and searched Python, Julia and R. The R libraries were by far the best. More subjectively, I like data.table better than any alternative in any language for the type of work I do.