This is a standalone desktop version of Hacklily.
This repo neither contains the UI nor the Lilypond backend. Instead, it is a wrapper that downloads both the JavaScript UI and Lilypond backend and ties them together.
It uses Qt and QWebEngine (Chromium).
It can automatically update the UI and the backend, but does not have an update mechanism for the wrapper itself.
Download Qt 5.9 and open up hacklily-standalone.pro and open up Qt Creator. Or just run
cd hacklily-standalone
mkdir build
cd build
qmake ..
make