Varnish

Varnish Cache is a web 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 web site. One of the essential attributes of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to choose how incoming requests should be tackled.

Memcached

Memcached is a generic memory object caching system for increasing the speed of dynamic database-powered 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 distributed memory object caching system uses a client'server architecture. The Memcached distributed memory object caching system is employed by some of the most traffic-hungry websites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, perfect for real-time content-intensive applications. 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 storage engine is the main software component that a database management system uses to create, read, modify and delete data from a database. Its latest edition features considerable improvements in efficiency, reliability and usability. InnoDB offers the standard ACID database transaction properties, along with foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.