millify
Converts long numbers to pretty, human-readable strings
approximate-number
Converts numbers into a more human-friendly format, similar to `ls`'s `--human-readable` flag (`ls -lh`) or Stack Overflow's reputation numbers. For example, 123456 becomes '123k'.
aveta
Convert long numbers into abbreviated and human-readable strings.
k-convert
Convert a number to k-metric or a k-metric number to a long number