Setup was built around rescued ball screws on rail guides. The steppers were ancient and underpowered so I upgraded them with NEMA 23 420N-M steppers and drivers, also a Temu Z -axis and an unused router from the shop.

Software is LinuxCNC - which is a challenge to dial in correctly, but you really learn how it all works when you have to go all the way down. The computer and power supplies were rescues as well. 

To generate the G-Code I use Carbide Create, Lightburn, and some of my own homebrew software depending on what I am cutting.

Power supplies from an old 3D printer, new drivers for the Nema steppers, and miscellaneous electronics from the bin. The computer was a hand-me-down that is happy running Ubuntu.