The software is QPixel. It was built specifically to be an open-source discussion system a la Stack Exchange. The largest public instance of it that I know of

The software is QPixel. It was built specifically to be an open-source discussion system a la Stack Exchange. The largest public instance of it that I know of is codidact.com; codidact.org is the sponsoring organization. https://github.com/codidact/qpixel https://github.com/codidact/qpixel