latexdiff
Determine differences between two LaTeX files.
TLDR
Determine changes between different versions of a LaTeX file (the resulting LaTeX file can be compiled to show differences underlined)
$ latexdiff [old.tex] [new.tex] > [diff.tex]
Determine changes between different versions of a LaTeX file by highlighting differences in boldface
$ latexdiff --type=BOLD [old.tex] [new.tex] > [diff.tex]
Determine changes between different versions of a LaTeX file, and display minor changes in equations with both added and deleted graphics
$ latexdiff --math-markup=fine --graphics-markup=both [old.tex] [new.tex] > [diff.tex]
