ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Clearip - Clearip provides the IP intelligence and fraud detection API in the market.
GeoNode.org - Open Source Geospatial Content Management System
ipapi - Web analytics with IP address lookup and location API
WIPmania - WIPmania provides a number of free products and services based on WorldIP geolocation database.
Carto - The future of GIS? It’s Spatial Data Science. CARTO is the world’s leading Location Intelligence platform for Data Scientists, Developers and Analysts in Enterprise.