OpenStreetMap

Open sea map.

The goal is to collect information useful to seamen and yachtsmen, and provide it in a convenient form.
Here is information about lighthouses, buoys and other navigation signs, repair shops, shops, restaurants, etc.

OpenSeaMap is created by OpenStreetMap and uses its database, filling the gap, so to speak.
OpenStreetMap deals with the land, and the water space is not affected.
OpenSeaMap fills water space with navigation information.

OpenStreetMap is a free project for the joint development of public maps and diagrams of cities, streets, roads with the help of manual or automatic data entry, as well as obtaining data from portable GPS-receivers.
The project site runs on the MediaWiki engine, similar to Wikipedia.

Maps are licensed under the free license CC-BY-SA 2.0 (for CC-BY-SA 3.0 license, Which is used in particular for Wikipedia's text content, the project has not been transferred, but version 2.0 is compatible with it, and OpenStreetMap has nothing to do with the Wikimedia Foundation.

I found the plans of many cities that are not in Google maps, or Yandex.Maps.

The 3D globe

Open topographic maps.

Free topographic maps based on OpenStreetMap data with a digital elevation model (SRTM).

The project site has the ability to download maps of regions for Garmin devices.

supported by the Friedrich-Alexander University Erlangen-Nuremberg