Varnish

Varnish Cache is a web accelerator also known as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will improve the speed of your website. One of the chief attributes of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to determine how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the load speed of dynamic database-powered sites. It is used to reduce the number of times an external data source (such as a database or API) is read by caching data and objects in RAM. The Memcached system uses a client/server architecture. The Memcached memory object caching system is employed by some of the most traffic-intensive web sites 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 building highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and efficient, ideal for real-time data-intensive Internet 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 RDBMS. A database engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. The latest edition of InnoDB features considerable improvements in efficacy, dependability and functionality. InnoDB offers the standard ACID-compliant transaction properties, as well as foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.