OPENTOPOMAP
OpenTopoMap - Free topographic map with elevation contours.
Worldwide topographic map based on OpenStreetMap and SRTM data. Shows elevation contours, hillshading, and terrain features. Free alternative to TRACESTRACK_TOPO without requiring an API key.
Tile Server: tile.opentopomap.org
Max Zoom: 17
API Key: Not required
Use Cases: Hiking apps, outdoor navigation, terrain visualization