TopoTidy
Plugin ID: 5668
Processing tools for line network cleanup: removing disconnected segments, snapping gappy endpoints, finding dangles, and removing duplicate lines (roads, rivers, pipes, etc.)
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TopoTidy adds four line-network cleanup algorithms to the QGIS Processing Toolbox: "Remove Disconnected Network Lines" (groups segments into network components using Union-Find and keeps only the main network by total length, segment count, or the largest component), "Snap Network Endpoints" (closes small digitizing gaps by snapping nearby endpoints together), "Find Dangling Endpoints" (flags loose ends that don't touch any other feature), and "Remove Duplicate Lines" (removes exact geometric duplicates left over from merged datasets).