▲ 5 ▼ Sloc, cloc, code - what happened on the way to faster cloc
For those who have never encountered cloc it is what appears to be simple command line tool (it is not simple and has a LOT of functionality!) that iterates through a given directory checking files against a known list of programming languages and then counting the number of code, comment and blank lines. For getting an overview of how large a project is and what languages are being used it is incredibly useful. I remember first using it early in my career to estimate project sizes.