File formats for 3d printing

• STL (wikipedia)
• 3MF (wikipedia)
• AMF (wikipedia)

File formats for CNC

• G-Code (RS-274) (wikipedia)
• STEP (ISO 10303-21) (wikipedia)

Software
GRBL is free, open-source firmware that enables precise control of your CNC machine. Read on to learn how to get it up and running! | All3DP
GRBL & Arduino: How to Set Up & Get Started | All3DP
http://www.linuxcnc.org/

Hardware
TinyG | Synthetos.com
Synthetos gShield (grblShield) V5
Adafruit A4988 Stepper Motor Driver Breakout Board
Motor voltage from 8V to 35VDC
2A-max current output
Vdd/Logic voltage from 3V to 5V
DIRection and STEP inputs

CNC Machines
Engadget - How-To: Build your own CNC machine (Part 1) (Where's the rest of it?)
DIY Milling Machine (wood) Bitch plywood and aluminum channels
DIY LIL CNC - A Wood CNC Machine
Mantis
TAIG Tools CNC Micro Mills

YouTubes
CNC Mill for under $100
I made a one-of-a-kind, DIY CNC Mill... twice.

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Free CNC Software
How to Install/use GRBL With Your Cnc Machine!