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.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
VAPTCHA is the abbreviation of (Variation Analysis based Public Turing Test to Tell Computers and Humans Apart), also known as gesture verification code, is a human-machine verification solution based on artificial intelligence and big data.