Varnish

Varnish Cache is a web application accelerator also referred to as an HTTP accelerator. 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 boost your site's speed. One of the essential advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the speed of dynamic database-driven sites. It is used to lower 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 distributed memory caching system uses a client'server architecture. The Memcached distributed memory object caching system is used by some of the most frequently visited web sites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, perfect for high-performance data-heavy network applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational database management system. A storage engine is the primary software component that a database management system uses to create, retrieve, update and delete data from a database. The latest edition of InnoDB offers considerable improvements in efficiency, stability and functionality. InnoDB offers the standard ACID-compliant database transaction attributes, as well as foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.