Varnish

Varnish Cache is a web accelerator also referred to 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 very, very fast and will increase your web site's speed. One of the essential attributes of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be tackled.

Memcached

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

Node.js

Node.js is a software system for building highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and effective, ideal for high-performance data-rich network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the underlying software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest release offers substantial improvements in efficacy, security and usability. InnoDB provides the standard ACID-compliant transaction properties, as well as declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.