Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
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.
MailChimp list management features help users organize and target their list for sending. They automatically remove bounce backs and unsubscribes from their list.