TextStat is an office utility, totally free, that provides you with detailed, exhaustive and thorough information of any text file that you indicate.
First of all, TextStat performs a check, after which it tells you the total number of characters, words, sentences, spaces, tabs, line breaks, etc. that the text contains; It can even make estimates of the total number of syllables it contains.
One of the most interesting counts that TextStat performs is the one that gives you information about which are the words that are most repeated in the text, and even tells you how many times each of them appears. It allows reading both TXT and HTML text documents.
You can free download TextStat 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.