If you need a strictly 2D CAD experience that feels like classic AutoCAD, LibreCAD is the answer. It is entirely free and lightweight. It is frequently used alongside external tracing tools to refine architectural layouts or mechanical parts after the initial raster-to-vector conversion. Best Browser-Based Tools
Students and freelancers converting PDF drawings with notes and dimensions. scan2cad free alternative
3.5 OpenCV-based custom pipelines (Python) If you need a strictly 2D CAD experience
For complex drawings requiring high precision, combining tools can be a game-changer. This workflow leverages the strengths of different software: scan2cad free alternative