For the impatient: https://github.com/frenetic-lang/manual/blob/master/programmers_guide/frenetic_programmers_guide.pdf
The official documentation toolchain is LaTeX.
TeXLive 2015 (or later) package has everything you need to build.
- TeXLive for Windows installation instructions are at http://www.tug.org/texlive/acquire-netinstall.html
- TeXLive for Mac, or MacTeX, installation instructions are at https://tug.org/mactex/
Then use whatever IDE you're comfortable with (TeXshop, etc.) to run programmers_guide/frenetic_programmers_guide.tex. Alternatively, from the command line you can run:
$ cd programmers_guide
$ make