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.
SEMrush is a marketing toolkit designed for digital marketing professionals, with tools for optimizing strategies across SEO, PPC, social media, content and PR.
MailMunch helps businesses to grow their customer base and improve lead generation by providing the tools to create a fully customized opt-in subscription.
PixaBay is a platform for sharing photos, illustrations, vector graphics, film footage and music, exclusively under the custom Pixabay license for free.
YouTube is a video sharing service where users can watch, like, share, comment and upload their own videos. The video service can be accessed on PCs, laptops, tablets and via mobile phones.