Varnish

Varnish Cache is a web accelerator also known 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 the speed of your site. One of the important features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for speeding up 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 system uses a client'server architecture. The Memcached system is used by some of the most traffic-heavy websites on the Internet and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for real-time data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational database management system. A database engine is the underlying software component that a database management system uses to create, read, update and delete data from a database. The latest version of InnoDB offers significant improvements in efficacy, dependability and functionality. InnoDB provides the standard ACID database transaction properties, as well as foreign key support. It is included by default in most binaries distributed by MySQL AB.