Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will increase the speed of your web site. One of the chief virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for increasing the loading speed of dynamic database-powered websites. It is used to lower 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 distributed memory object caching system uses a client/server architecture. The Memcached memory caching system is used by some of the most frequently visited sites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A database engine is the main software component that a database management system uses to create, read, modify and delete data from a database. The latest edition of InnoDB features considerable improvements in performance, stability and usability. InnoDB provides the standard ACID transaction features, as well as declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.