Gravatar is a service for providing globally unique avatars and was created by Tom Preston-Werner. It is owned by Automattic, having integrated it into their WordPress.com blogging platform.
Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.
PHP: Hypertext Preprocessor is a server-side scripting language designed for Web development, but also used as a general-purpose programming language. PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems, and web frameworks.
Facebook Pixel helps organizations measure customer actions, build audiences and unlock optimisation tools. Facebook pixel is a snippet of JavaScript code that allows you to track visitor activity on your website.
Inspectlet records videos of users visitors as they use users site, allowing to see everything they do. See every mouse movement and keypress interaction. Inspectlet helps to understand why web visitors behave the way they do on their site through recorded sessions, varying heatmaps, and detailed form analytics.
Mailgun is an email automation service offering a complete cloud-based email service for sending, receiving & tracking email sent through user websites & apps.