Varnish

Varnish Cache is a web accelerator also known as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will increase your website's speed. One of the important strengths of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to specify how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the load 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 object caching system uses a client'server architecture. The Memcached system is employed by some of the most regularly visited websites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, suitable for high-performance content-heavy network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB features substantial improvements in efficiency, reliability and functionality. InnoDB offers the standard ACID-compliant transaction features, along with referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.