un­tex – Strip (La)TeX com­mands from source file

The pro­gram will re­move “some LaTeX com­mands” from a file (it will op­tion­ally try to strip out all math­e­mat­ics, too). It also has an op­tion to hon­our \in­put and \in­clude com­mands in the file.
The pro­gram is dis­tributed as C source in a .tar.gz file.