LibreCAD is a fork of QCAD’s older codebase. It is 100% free and does not nag you to upgrade. However, its raster-to-vector tool is rudimentary—it essentially traces based on color ranges.
100% accurate, no stray vectors, perfect for complex geometry. Cons: Very time-consuming; requires CAD skill. scan2cad free alternative
Many people hunt for alternatives without realizing that AutoCAD has a built-in PDF import function that has improved drastically in recent years. LibreCAD is a fork of QCAD’s older codebase