Varnish

Varnish Cache is a web application accelerator also called as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will increase your website's loading speed. One of the main attributes 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 general-purpose memory object caching system for boosting the loading speed of dynamic database-powered websites. It is used to reduce 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 memory object caching system uses a client/server architecture. The Memcached distributed memory object caching system is employed by some of the most traffic-heavy sites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, perfect for high-performance content-rich network apps. 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 relational database management system. A storage engine is the primary software component that a database management system uses to create, read, update and delete data from a database. Its latest edition features considerable improvements in efficiency, stability and functionality. InnoDB offers the standard ACID database transaction properties, as well as declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.