The info you should know before making a map app.

OpenStreetMap(OSM)

• You can get oss data from this map.
• https://www.geofabrik.de/
  • You can get raw data in OSM.

Overpass API

• You can use this to get OSM data.
• overpass turbo
  • You can try to use overpass API.

Open Source Routine Machine (OSRM)

• https://project-osrm.org/
• API references
  • https://project-osrm.org/docs/v5.5.1/api/#general-options
• the OSS to detect the route on the map
• it has docker container

GeoJSON

• You can easily debug your point, line, polygon data on a map.
• geojson.io
  • You can debug your geojson.
• https://github.com/paulmach/go.geojson
  • the library to handle geojson with golang.

Database

• PostGIS
  • https://postgis.net/
  • the application to expand PostgreSQL to treat with the information about map, like point, polygon.
• SpatiaLite
  • https://www.gaia-gis.it/fossil/libspatialite/index
  • for sqlite