Vernier
Vector editing toolkit: smart snapping, topology validation, polygon splitting to exact areas, attribute and spatial joins, DXF/DWG and KMZ exchange, autosave backups, and an optional CAD Mode with a typed command bar.
Vernier is a vector editing toolkit for QGIS.
The toolbox adds a one-click snapping profile, a topology validator that
outputs styled error layers, topology-aware Remove Close Vertices,
Find Duplicate Geometries, polygon splitting to exact target areas,
polygon centerline (medial axis) extraction, styled DXF/DWG import and DXF
export with labels, multi-layer KMZ export with label placemarks, attribute
and spatial joins, quick symbology templates, versioned autosave backups with
a restore browser, and a live area readout for selected polygons.
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, and the import/export tools read and write drawings from any
of them.
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.
* Centerline extraction uses 'shapely', which already ships with QGIS.
* 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.