Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will increase your website's loading speed. One of the chief features of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory caching system for speeding up dynamic database-driven websites. 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 caching system is used by some of the most frequently visited websites on the Internet and is supported by famous web applications 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-intensive Internet apps. 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 database engine is the underlying software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB features significant improvements in efficiency, security and usability. InnoDB offers the standard ACID database transaction features, as well as referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.