Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will boost the speed of your site. One of the major features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to specify how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory caching system for increasing the speed of dynamic database-powered websites. 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 two-tier architecture. The Memcached memory caching system is used by some of the most traffic-heavy websites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, great for high-performance content-heavy 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 DBMS. A storage engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. The latest version of InnoDB offers considerable improvements in efficiency, security and usability. InnoDB offers the standard ACID-compliant transaction attributes, as well as declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.