Vernier
DXF/DWG import and export, KMZ, topology validation, exact-area polygon splitting. 16 editing tools in one toolbar, with an optional CAD command bar.
Vernier is a vector editing toolkit for QGIS: 16 tools in one toolbar, built for surveying and cadastral work but general enough for any vector editing.
EXCHANGE - styled DXF/DWG import (one QGIS layer per CAD layer, true colors, any DWG version via ODA), DXF export with labels as TEXT entities placed and rotated per polygon, and multi-layer KMZ export with label placemarks sharing the same prefix/suffix templates.
VALIDATION - a topology validator that turns each kind of error (invalid geometries, duplicates, overlaps, gaps, vertex errors) into its own styled layer with the details as attributes, plus Find Duplicate Geometries and topology-aware Remove Close Vertices.
EDITING - splitting polygons to exact target areas (paste targets from Excel, live remainder), centerline (medial axis) extraction, a one-click snapping profile, and CAD Lines to Polygons.
DATA - attribute and spatial joins with match preview, quick symbology templates, versioned autosave backups with a restore browser, a live ellipsoidal area readout, and geoprocessing shortcuts.
CAD MODE (off by default) adds a typed command bar with autocomplete, a dark canvas with a scalable grid, and a live status strip. It follows the workspace conventions shared by AutoCAD, BricsCAD, ZWCAD, GstarCAD, DraftSight and other DWG/DXF software.
EXTERNAL DEPENDENCIES - all core tools run on a stock QGIS with no extra packages. Only these optional tools need more:
- DXF import/export needs the 'ezdxf' Python package. The plugin offers a one-click, consent-based install into a private folder of the QGIS user profile - never into the QGIS installation, and never without asking. The profile folder is used so the package survives plugin updates. It can also be installed manually with 'python -m pip install ezdxf' from the OSGeo4W Shell on Windows or your system Python on Linux/macOS.
- DWG (not DXF) import needs the free ODA File Converter, installed separately by the user. The plugin only locates it on disk and never downloads it.