Varnish

Varnish Cache is a web accelerator also called 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 make your website load much faster. One of the chief advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to choose how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for boosting the speed of dynamic database-powered websites. 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 memory caching system uses a client/server architecture. The Memcached distributed memory object caching system is employed by some of the most popular sites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and efficient, ideal for real-time data-heavy network 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 database engine is the primary software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB offers substantial improvements in efficacy, dependability and functionality. InnoDB offers the standard ACID database transaction properties, as well as foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.