QuickerSite is available on GitHub as from 2020.
You may want to star, fork, follow, download and/or contribute to the project over there. Thank you!
I have recently been (re)doing some sites.
Actually, the first one is a QS on a Mobirise template. The 3 others are pure Mobirise, nothing to do with QS. I recently bought myself a copy of Mobirise. It's an amazing simple little tool that creates great sites... I'm using it for some years already and I must admit it has grown to a very mature state. Especially when you combine it with some custom JS, CSS and/or iFrames, the sky is the limit.