For example it can convert output of find into a nicely formatted tree (or JSON).
$ cd fzf.kak/
k/p/fzf.kak $ fd . | frangipanni -breaks /
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
README.md
rc
fzf.kak
modules
VCS
fzf-bzr.kak
fzf-git.kak
fzf-hg.kak
fzf-svn.kak
fzf-buffer.kak
fzf-cd.kak
fzf-ctags.kak
fzf-file.kak
fzf-grep.kak
fzf-project.kak
fzf-search.kak
fzf-vcs.kak
sk-grep.kak
More examples in the readme.