Varnish

Varnish Cache is a web accelerator also known as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will boost your site's speed. One of the main advantages of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to choose how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory object caching system for boosting the speed of dynamic database-powered web sites. It is used to decrease 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 distributed memory caching system uses a client'server architecture. The Memcached memory object caching system is used by some of the most traffic-intensive web sites on the World Wide Web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, ideal for real-time data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source RDBMS. A database engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB features serious improvements in performance, dependability and usability. InnoDB offers the standard ACID transaction properties, along with declarative referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.