Varnish

Varnish Cache is a web application accelerator also called as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will boost your website's loading speed. One of the key features of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the loading speed of dynamic database-powered web sites. It is used to lower the number of times an external data source (such as a DB or API) is read by caching data and objects in RAM. The Memcached memory caching system uses a client'server architecture. The Memcached distributed memory object caching system is employed by some of the most regularly visited websites on the World Wide Web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, perfect for high-performance content-heavy Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the main software component that a database management system uses to create, read, update and delete data from a database. The latest version of InnoDB features significant improvements in efficiency, security and functionality. InnoDB provides the standard ACID-compliant database transaction attributes, as well as referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.