TopoTidy
Turn messy vector data into clean topology in QGIS: cleanup tools (snap, trim, extend, split, dissolve, fix geometry, simplify, remove duplicate/disconnected lines) and topology-rule checks, driven from one dockable panel that names the tool to fix each error โ and every fixer can edit your layer in place.
๐๐๐ฌ๐ฌ๐ฒ ๐ฏ๐๐๐ญ๐จ๐ซ ๐๐๐ญ๐ ๐ข๐ง, ๐๐ฅ๐๐๐ง ๐ญ๐จ๐ฉ๐จ๐ฅ๐จ๐ ๐ฒ ๐จ๐ฎ๐ญ โ ๐ฐ๐ข๐ญ๐ก๐จ๐ฎ๐ญ ๐๐ฏ๐๐ซ ๐ฅ๐๐๐ฏ๐ข๐ง๐ ๐๐๐๐. ๐๐จ๐ฉ๐จ๐๐ข๐๐ฒ ๐ฐ๐จ๐ซ๐ค๐ฌ ๐ข๐ง ๐ญ๐ฐ๐จ ๐ก๐๐ฅ๐ฏ๐๐ฌ.
(1) ๐๐ก๐ ๐๐จ๐ฉ๐จ๐ฅ๐จ๐ ๐ฒ ๐ฉ๐๐ง๐๐ฅ. Add your layers, tick the rules they must obey โ no dangles, no overlaps, no gaps, no pseudo-nodes, must be single-part, must sit inside or along another layer, and more โ set a tolerance, and hit Validate. A dockable report shows exactly what is wrong and, for every kind of error, names and opens the tool that repairs it. Click any error to zoom straight to it on the map; accept the legitimate ones (a cul-de-sac, a bridge over a river) as exceptions that stick across re-runs; then re-validate and watch the counts fall to zero. A manual-editing toolbar (vertex, split, trim/extend, snapping) is right there for the fixes only you can decide.
(2) ๐๐ก๐ ๐๐ซ๐จ๐๐๐ฌ๐ฌ๐ข๐ง๐ ๐ญ๐จ๐จ๐ฅ๐๐จ๐ฑ. Every fix is also a standalone algorithm you can run, batch, or drop into a model: Snap Network Endpoints, Trim, Extend, Find Dangling Endpoints, Remove Duplicate Lines, Remove Disconnected Network Lines, Split with Lines, Multipart to Singleparts, Dissolve, Fix Geometry and Simplify. Each one can write a brand-new fixed layer or edit the input layer in place.
Built for roads, rivers, parcels and utility networks. Runs in QGIS 3.16 through QGIS 4.0 (Qt6).