Varnish

Varnish Cache is a web 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 contents. Varnish Cache is very, very fast and will make your website load much faster. One of the important virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to determine how incoming requests should be tackled.

Memcached

Memcached is a generic distributed 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 memory caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most frequently visited websites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and efficient, excellent for high-performance content-rich Internet apps. 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 relational database management system. A storage engine is the main software component that a database management system uses to create, read, update and delete data from a database. The latest edition of InnoDB features substantial improvements in efficacy, reliability and usability. InnoDB offers the standard ACID database transaction attributes, along with referential integrity support. It is included as standard in most binary distributions from MySQL AB.