Layers.openstreetmap.fr - Tuiles pour contrôle de données / Tile service with data checks. WHODIDIT: OpenStreetMap Changeset Analyzer. Analyseur de Relation. Data CC-By-SA by OpenStreetMap OSM France - OSM.
Data consistency checks for OSM. MapDust - Helping to improve the OpenStreetMap - OSM. Quality Assurance. See also: Accuracy, Completeness Quality Assurance tools help lead to better quality of OSM data.
Often, the tools achieve this by providing a list of bugs in the data, which mappers can then go and fix using editing tools. OpenStreetBugs - Aidez-nous à améliorer OpenStreetMap. OSM Quality Assurance application on QualityStreetMap.org.