It's a free software package that can create and build 3D objects. By contrast, Cura is a free 3D "slicer" program that converts digital models into layers that can be sent to a 3D printer.
Klipper does the exact same job, but it does it differently. On the 3D printer board is a tiny piece of software that does very little. It’s a bit like a device driver for the printer.
Formlabs is branching out from its business roots to offer its resin expertise to the masses.