TeXcount is a Perl script that counts the number of words in the text of LaTeX files. It has rules for handling most of the common macros and provides colour coded output indicating which parts have been counted.
Go to https://app.uio.no/ifi/texcount/ for more information or to access the script online as a web service.
There is documentation at different levels of detail and technicality:
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QuickReference gives a quick overview of options and TeXcount instructions which may be used to control how TeXcount processes TeX documents.
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TeXcount is the main documentation giving a detailed explanation of how TeXcount processes TeX documents, and how to use options and TeXcount instructions to customise the word counting and reporting the results.
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TechDoc is the technical documentation of the internals of TeXcount.
Additional documentation, including scripts and examples, are available on the TeXcount web site: https://app.uio.no/ifi/texcount/
Questions posted to StackExchange and tagged texcount will automatically notify the TeXcount developer: https://tex.stackexchange.com/questions/tagged/texcount
The package, i.e. the script and all accompanying files, is distributed under the LaTeX Project Public License.