Varnish

Varnish Cache is a web application accelerator also known as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will make your site load much faster. One of the key attributes of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory object caching system for increasing the speed of dynamic database-driven 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 two-tier architecture. The Memcached memory object caching system is used by some of the most popular web sites on the web and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, great for real-time data-heavy Internet 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 relational database management system. A database engine is the main software component that a database management system uses to create, read, update and delete data from a database. The latest edition of InnoDB offers significant improvements in efficacy, stability and usability. InnoDB provides the standard ACID transaction features, along with foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.