Of all the Kanban-style board tools, Wekan is the one that most closely resembled the Trello interface. Wekan is entirely written in JavaScript.
Wekan was formerly known as Libreboard. They have a free hosted demo that you can try out, or you can download and install it yourself. They make this especially easy, providing a container image, VirtualBox image, or the ability to install from source, and it’s integrated into Sandstorm if you’re already using that platform for hosting a personal cloud server.