Varnish

Varnish Cache is a web application accelerator also referred to 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 content. Varnish Cache is very, very fast and will boost your site's speed. One of the chief attributes of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the speed of dynamic database-powered 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 memory object caching system uses a client'server architecture. The Memcached distributed memory object caching system is employed by some of the most traffic-intensive sites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, suitable for real-time content-intensive Internet applications. 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 storage engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest release features significant improvements in efficacy, security and functionality. InnoDB provides the standard ACID-compliant database transaction attributes, along with foreign key support. It is included as standard in most binary distributions from MySQL AB.