A multi-dimensional charting library built to work natively with crossfilter and rendered using d3.js
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
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.