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 content. Varnish Cache is very, very fast and will increase the speed of your website. One of the key strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to determine how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory caching system for boosting the speed of dynamic database-driven web sites. It is used to lower 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 distributed memory caching system uses a client'server architecture. The Memcached memory object caching system is employed by some of the most regularly visited websites on the Internet and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, perfect for high-performance 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 storage engine is the main software component that a database management system uses to create, read, modify and delete data from a database. The latest edition of InnoDB offers substantial improvements in performance, stability and usability. InnoDB provides the standard ACID-compliant transaction features, along with declarative referential integrity support. It is included by default in most binaries distributed by MySQL AB.