I will present a selection of user-written Mata functions that serve to streamline the process of writing other Mata functions, and I will demonstrate what makes them handy. I will present debugging/programming functions for the following: dropping and re-creating one or a few functions without clearing Mata of all other useful info; displaying the contents of a matrix in a compact and informative way; and copying private function information into the global space. I will present text-handling functions for the following: concatenating and dividing blocks of text; processing lists of file/directory paths; and converting between matrices of text and ASCII values. I will present more general-purpose functions for the following: combining matrices of different sizes; reading and writing Mata matrices to spreadsheet files; generating a map of matching values in two matrices; and returning an entire (small) matrix of values to Stata locals. I will finish with a combined Stata/Mata command for storing Stata command preferences.