Tile38 is an open source (MIT licensed), in-memory geolocation data store, spatial index, and realtime geofence. It supports a variety of object types including lat/lon points, bounding boxes, XYZ tiles, Geohashes, and GeoJSON.
- Variety of protocols, including [http](#http) (curl), [websockets](#websockets), [telnet](#telnet), and the [Redis RESP](http://redis.io/topics/protocol).
- Server responses are [RESP](http://redis.io/topics/protocol) or [JSON](http://www.json.org).