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 really, really fast and will boost your website's loading speed. One of the key advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

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

Node.js

Node.js is a platform for building highly scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output 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 a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the main software component that a database management system uses to create, retrieve, update and delete data from a database. The latest release of InnoDB features serious improvements in efficacy, security and usability. InnoDB provides the standard ACID transaction attributes, as well as referential integrity support. It is included by default in most binary distributions from MySQL AB.