Varnish

Varnish Cache is a web application accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will improve your website's speed. One of the important advantages of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for increasing the speed of dynamic database-powered sites. 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 two-tier architecture. The Memcached memory object caching system is employed by some of the most frequently visited websites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and efficient, excellent for real-time data-intensive Internet 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, read, modify and delete data from a database. Its latest version offers substantial improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID database transaction attributes, along with referential integrity support. It is included as standard in most binary distributions from MySQL AB.