Google Cloud Trace is a distributed tracing system that collects latency data from applications and displays it in the Google Cloud Console.
Gravatar is a service for providing globally unique avatars.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
SweetAlert is a JavaScript library that provides alternative alert and modal dialog boxes for web applications, with customisable features, aiming to improve the user interface of the default browser dialogs.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.