The Range program is used for analysing the vocabulary load of texts. It can tell you how much and what vocabulary occurs in a particular text or group of texts. It used to be called VORDS, FVORDS, and VocabProfile. It is available here to download with either the GSL/AWL lists (General Service List / Academic Word List) or with the British National Corpus lists, plus instructions for using the program.
Also inside the downloadable zip file with Range is a program named Frequency. Frequency turns a text or texts into a word list with frequency figures.