The BoxTurtle is exactly what it appears to be - an open source AMS style filament changer for Klipper machines. BoxTurtle requires the AFC-Klipper Add-on found here. The goal of BoxTurtle is to deliver a user experience as close to an AMS as possible in vanilla Klipper, ie an AMS for any klipperised printer regardless of form factor but Voron Design printers in particular.
LDO BoxTurtle (LBT) is totally based on BoxTurtle original design, with some added extras.
Visit the Armored Turtle GitHub for more info or the Assembly manual.