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 HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will make your website load much faster. One of the main virtues of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the load speed of dynamic database-powered web 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 memory caching system uses a client'server architecture. The Memcached distributed memory caching system is employed by some of the most popular sites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, ideal for high-performance content-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 database management system. A database engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release offers considerable improvements in efficiency, reliability and usability. InnoDB offers the standard ACID transaction features, along with foreign key support. It is included by default in most binaries distributed by MySQL AB.