'expss' package implements some popular functions from spreadsheets and SPSS Statistics software. Implementations are not complete copies of their originals. I try to make them consistent with other R functions. See examples in the vignette and in the help.
IF ifelse
AVERAGE mean_row
SUM sum_row
MIN min_row
MAX max_row
VLOOKUP vlookup
COUNTIF count_if
AVERAGEIF mean_row_if
SUMIF sum_row_if
MINIF min_row_if
MAXIF max_row_if
IFS ifs
IFNA if_na
MATCH match_row
INDEX index_row