Varnish

Varnish Cache is a web accelerator also called as a caching HTTP reverse proxy. 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 increase the loading speed of your website. One of the chief merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to choose how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory caching system for boosting the speed of dynamic database-driven 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 distributed memory caching system uses a client'server architecture. The Memcached memory object caching system is used by some of the most frequently visited 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 network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, ideal for high-performance data-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source DBMS. A database engine is the principal software component that a database management system uses to create, read, update and delete data from a database. The latest release of InnoDB offers serious improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID database transaction features, as well as declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.