I no longer use GitHub for original projects. Source for fftool isn't public yet but I understand the concern — running an unaudited binary is a real ask. My site leans toward educational, so that people might consider building the tool from the instructions in the article. I'll probably post the source on the site as a zip or tarball at some point so people can more easily build it. The asciinema suggestion is a good one — I'll look into it.