Varnish

Varnish Cache is a web application accelerator also called as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will boost the speed of your site. One of the essential virtues of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the loading speed of dynamic database-powered websites. It is used to lower 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 object caching system uses a client'server architecture. The Memcached memory object caching system is used by some of the most frequently visited web sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable network applications. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, suitable for real-time data-intensive network applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source DBMS. A storage engine is the principal software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest version offers serious improvements in efficacy, dependability and usability. InnoDB provides the standard ACID-compliant transaction features, as well as declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.