Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will improve the loading speed of your website. One of the key features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to determine how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory object caching system for increasing the speed of dynamic database-driven websites. It is used to decrease 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 caching system uses a client/server architecture. The Memcached distributed memory object caching system is employed by some of the most frequently visited sites on the World Wide Web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, suitable for real-time content-heavy Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built 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, read, update and delete data from a database. Its latest edition offers considerable improvements in efficacy, security and functionality. InnoDB offers the standard ACID-compliant database transaction properties, as well as declarative referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.