From messing with librepcb it seems like a great alternative to eagle and very similar layout. One of the programs I use with eagle is pcbgcode https://groups.io/g/pcbgcode this script gives some user ability to create cnc files for machining pcb and drill files. There is a bit more control than using gerbers and pcb2gcode (multi pass machining).
An addon for direct gcode output with similar features would be an awesome addition for simple cut boards.
Awesome work on librePCB