Varnish

Varnish Cache is a web application accelerator also referred to as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will improve your site's speed. One of the essential attributes of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to determine how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory object caching system for boosting the loading speed of dynamic database-powered sites. It is used to decrease 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 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 platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, great for real-time data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A database engine is the primary software component that a DBMS uses to create, read, modify and delete data from a database. The latest version of InnoDB offers significant improvements in efficiency, reliability and functionality. InnoDB offers the standard ACID transaction features, along with declarative referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.