The articles are listed per API.

Google Maps JavaScript API

Visualizing data: Mapping earthquakes with the Google Maps API
This Google Developer Academy tutorial shows you how to import data, display that data on a map using simple markers and use symbols and heatmaps to improve the appearance and legibility of your map.
Visualizing data: Combining two data sources on a map
This article explains how to take two data sources, one GeoJSON and one pure JSON, and combine them in a basic map visualisation using the data layer.
Describes the basic techniques for geolocation in web applications.
Using PHP/MySQL with Google Maps
Shows how to use PHP/MySQL and the Google Maps JavaScript API to create a map that polls data from a database and shows as markers.
Creating a Store Locator with PHP & MySQL
Shows how to create a store locator where users can search for nearest stores to a geocoded location, and see results as markers on a mobile-optimized map, using PHP/MySQL for the backend.
From Info Windows to a Database: Saving User-Added Form Data
Shows how to prompt users to fill out information in an infowindow, and then save that information back into a database.

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Google Maps APIs
Google Maps APIs