Hi there @RockinRiley.
µCNC is a firmware designed to be compatible with Grbl protocol and also capable of being flexible and modular like LinuxCNC.
Currently supports Avr MCUs (including Arduino Uno) but also Stm32F1, Stm32F4 and samd21 (arduino zero).
Also has support for corexy and delta kinematics (besides regular cartesian) and other features.
You can read more about it in the github page.
It is in it essence like Gbrl more focused on CNC and laser, not so much 3D printing (although the thought of giving it a spin as come to my mind 
…one Day I’ll give it a go)
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