Varnish

Varnish Cache is a web 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 very, very fast and will increase the loading speed of your site. One of the major strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory object caching system for speeding up dynamic database-powered web sites. It is used to reduce 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 object caching system uses a client'server architecture. The Memcached memory object caching system is employed by some of the most traffic-heavy sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A storage engine is the main software component that a database management system uses to create, read, modify and delete data from a database. The latest version of InnoDB offers substantial improvements in efficiency, security and functionality. InnoDB offers the standard ACID-compliant database transaction attributes, along with declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.