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 the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will boost your web site's speed. One of the chief advantages of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the speed of dynamic database-powered web sites. It is used to reduce 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 distributed memory object caching system uses a client'server architecture. The Memcached memory object caching system is employed by some of the most traffic-heavy sites on the Internet and is supported by popular Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network applications. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, perfect for real-time data-heavy apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database 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, modify and delete data from a database. The latest edition of InnoDB offers significant improvements in efficiency, security and functionality. InnoDB offers the standard ACID transaction attributes, as well as foreign key support. It is included as standard in most binary distributions from MySQL AB.