Varnish

Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will boost the loading speed of your site. One of the chief strengths of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing 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 caching system uses a client'server architecture. The Memcached system is employed by some of the most regularly visited web sites on the web and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable network applications. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, great for high-performance content-intensive Internet 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 database management system. A storage engine is the main software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB offers substantial improvements in efficiency, security and usability. InnoDB offers the standard ACID-compliant database transaction attributes, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.