Finding the right CAM software for your CNC router can feel overwhelming, especially if you’re looking for free solutions that are also compatible with GRBL controllers (the firmware that powers many desktop CNC routers). The good news: there are excellent free options out there, ranging from beginner-friendly tools to advanced open-source projects.
This guide will walk you through the best free CAM tools for CNC routers, highlight their unique strengths, and give you a detailed comparison so you can choose the best fit for your projects.
What to Look For in Free CAM Software
- GRBL Compatibility – Does the software generate clean G-code your CNC controller can interpret?
- Workflow Coverage – Is it limited to 2D/2.5D, or can it handle true 3D machining?
- Ease of Use – Is the interface intuitive, or does it require technical setup?
- Simulation & Safety – Can you preview toolpaths before cutting to avoid errors?
- Machine Control – Does it include a built-in G-code sender, or do you need a separate program?
CAMLab — Browser-Based 3D Toolpaths
Best for: Hobbyists wanting 3D reliefs without heavy software installs
CAMLab, developed by Sienci Labs, is a web-based CAM program built on the Kiri:Moto engine. It lets you import STL models and generate both roughing and finishing toolpaths. The exported G-code is GRBL-compatible, though you’ll need a separate sender like CNC.js or bCNC to run the file.
- Runs entirely in the browser
- Handles 2.5D and full 3D toolpaths
- Great for beginners exploring relief carving
Its limitation is that it doesn’t send G-code to your machine directly, but paired with CNC.js, it becomes a powerful, free workflow.
Easel — All-in-One Online Solution
Best for: Beginners and simple 2D/2.5D projects
Inventables’ Easel combines design, CAM, and machine control in a single online platform. It’s extremely beginner-friendly: you can draw shapes, add text, and immediately generate toolpaths. Easel exports GRBL G-code directly and can control your CNC if it’s connected to your computer.
- Browser-based with no installation required
- Native GRBL compatibility
- Ideal for sign-making, engraving, and cutouts
The downside: Easel does not support full 3D toolpaths—so if you want detailed relief carving, you’ll need something like CAMLab or Fusion 360.
OpenBuilds CAM + CONTROL
Best for: Lightweight workflows and simple vector files
This solution is split into two parts: OpenBuilds CAM (a web-based G-code generator for SVG, DXF, and image files) and OpenBuilds CONTROL (a desktop application that connects to your GRBL router to run jobs).
- Converts vector artwork into GRBL-friendly toolpaths
- Includes a dedicated sender app for reliable control
- Works both online and offline
It doesn’t have 3D capabilities, but for sign-making, logos, and light routing, it’s efficient and easy to use.
bCNC — Feature-Rich Desktop Controller
Best for: Power users who want control, probing, and editing
bCNC is a Python-based, open-source program designed specifically for GRBL. It goes beyond simple CAM:
- Built-in CAM tools (pocketing, contouring, drilling, and basic 3D slicing)
- Full GRBL sender with probing, autoleveling, macros, and editing
- Cross-platform (Windows, Mac, Linux, Raspberry Pi)
Its interface is less polished than commercial software, but bCNC is a powerhouse if you want granular control of your machine.
CNC.js — Advanced G-Code Sender
Best for: Machine control, visualization, and automation
CNC.js isn’t a CAM tool by itself—it’s a web-based G-code sender that runs locally via Node.js. It’s compatible with GRBL, Smoothieware, and TinyG, and includes advanced features:
- 3D G-code visualization
- Jog controls, macros, and probing widgets
- Customizable with plugins and responsive UI
Most users pair CNC.js with CAMLab, Fusion 360, or another CAM generator. It’s one of the most versatile control environments available for free.
GrblGru — Free CAM + Simulator
Best for: Learning and previewing jobs before cutting
GrblGru combines CAM, machine control, and 3D simulation. It supports GRBL and TinyG, making it ideal if you want to see your toolpaths in action before risking material.
- Simulates machines in 3D
- Generates G-code and sends it to GRBL routers
- Beginner-friendly interface with a moderate learning curve
Fusion 360 (Personal License)
Best for: Professional-level CAD + CAM
Autodesk Fusion 360 is a full CAD + CAM suite, free for hobbyists and startups. It includes advanced machining strategies for 2.5D, 3D, and multi-axis milling.
- Professional-grade CAM engine
- Requires GRBL post-processor setup
- Cloud-connected but installs as a desktop app
It’s the most powerful option here but also the most complex—best suited if you’re doing precision 3D parts, not just basic signs.
Detailed Comparison Table
| Software | Platform | 2D/2.5D | 3D Toolpaths | Post-Processor for GRBL | G-code Sending | Simulation | Ease of Use | Offline / Online |
|---|---|---|---|---|---|---|---|---|
| CAMLab | Browser | ✅ | ✅ (STL roughing & finishing) | Native GRBL G-code | ❌ (needs sender) | ❌ | ⭐⭐⭐ (medium) | Online |
| Easel | Browser | ✅ | ❌ (2.5D only) | Direct GRBL export | ✅ (built-in) | ❌ | ⭐⭐⭐⭐ (very easy) | Online |
| OpenBuilds CAM + CONTROL | Web + Desktop | ✅ | ❌ | Native GRBL G-code | ✅ (CONTROL app) | ❌ | ⭐⭐⭐ (easy) | Both |
| bCNC | Desktop (Python) | ✅ | ✅ (basic 3D slicing) | Native GRBL | ✅ | ✅ (toolpath preview) | ⭐⭐ (steeper curve) | Offline |
| CNC.js | Local web server | ✅ | ❌ (CAM external) | Reads GRBL G-code | ✅ | ✅ (3D visualizer) | ⭐⭐ | Offline (local browser) |
| GrblGru | Desktop | ✅ | ✅ | GRBL/TinyG compatible | ✅ | ✅ (3D machine simulation) | ⭐⭐⭐ (moderate) | Offline |
| Fusion 360 (Hobby) | Desktop (Cloud) | ✅ | ✅ (full 3D CAM) | GRBL via custom post | ❌ (needs sender) | ✅ (advanced simulation) | ⭐⭐ (complex) | Hybrid |
| PyCAM / Others | Desktop (Open-source) | ✅ | ✅ | Exports GRBL-compatible G-code | ❌ | ❌ | ⭐ (technical) | Offline |
Recommendations
- Simplest workflow: Easel (design → CAM → run, all online)
- Best free 3D CAM in the browser: CAMLab (pair with CNC.js)
- Best offline control powerhouse: bCNC (all-in-one CAM + sender)
- Best controller for CAM-generated files: CNC.js (feature-rich sender)
- Best for simulation and teaching: GrblGru
- Best for advanced CAD/CAM: Fusion 360 (if you don’t mind setup)
FAQ: Free CAM Software for CNC Routers
What is CAM software used for in CNC routing?
CAM (Computer Aided Machining) software converts design files into G-code, which tells your CNC router how to move, cut, drill, or carve material. Without CAM, your CNC machine cannot interpret design files like DXF or STL.
Can I use free CAM software for professional work?
Yes, many free CAM tools like Fusion 360 (Hobby License) or bCNC are used in small shops and hobby businesses. However, for high-volume production, commercial CAM solutions may offer more automation and support.
Which free CAM software is easiest for beginners?
Easel is the easiest for beginners because it combines design, toolpath generation, and G-code sending in one simple browser-based program.
Which free CAM software supports 3D toolpaths?
CAMLab, bCNC, GrblGru, and Fusion 360 (Hobby License) all support 3D toolpaths. Easel and OpenBuilds CAM are limited to 2.5D operations like profiles and pockets.
Do I need both CAM software and a G-code sender?
Sometimes. Tools like Easel, bCNC, and GrblGru include sending capabilities. Others, like CAMLab and Fusion 360, only generate G-code—you’ll need a sender like CNC.js or OpenBuilds CONTROL to run the file on your CNC router.
What’s the best free CAM software overall?
There’s no single “best” tool—it depends on your needs:
- Easel if you want simplicity
- CAMLab + CNC.js if you want browser-based 3D
- bCNC if you want full control and offline reliability
- Fusion 360 if you need advanced CAD + CAM
