The short answer
The best LightBurn alternative depends on why you are leaving LightBurn. For a free Windows GRBL diode setup, LaserGRBL is the obvious pick. For a free, open-source program that also runs on macOS and Linux, Rayforge is the most active option. For a stock K40 CO2 laser, MeerK40t is strong if you do not mind a steeper learning curve. If you want native Mac and Windows apps, CO2 lasers with Ruida controllers, camera placement and photo preparation in the same app, Vextrify is the most complete modern alternative — with a free browser preview to start.
- Free Windows diode → LaserGRBL
- Free open source, Mac and Linux → Rayforge
- Free open source K40 → MeerK40t
- Mac, Ruida CO2, photo prep + control → Vextrify