WooCommerce is one of the most popular eCommerce platforms. It is a great choice if you already use Wordpress and would like to extend your site with an e-store functionality.
Google analytics is a platform that shows you information about traffic on your website or app.
Gmail is one of free web mail services, provided by Google. And to be precise, this is basic gmail functionality. On the other hand, registering in gmail, by default creates for you an account in google+, which allows you to do much more. But to focus on programmatic case, let’s talk about web mail service only
Everybody know what Google is, and it would be a cliche introducing it from scratch. But not everybody knows, that except search engine and maps, Google is a provider of enormous number of APIs. You can check it here
Salesforce is one the biggest CRM (Customer Relationship Management) software in the world. It’s sold in a SAAS (Software As A Service) model which means, that you pay a monthly fee for using the software and both the data and the actual software is kept on Salesforce servers.