Varnish

Varnish Cache is a web application accelerator also called 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 increase your web site's speed. One of the main virtues 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 distributed memory object caching system for speeding up dynamic database-powered websites. 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 caching system uses a two-tier architecture. The Memcached system is used by some of the most traffic-intensive web sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and efficient, excellent for high-performance content-heavy applications. 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 RDBMS. A database engine is the primary software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest edition offers significant improvements in efficiency, stability and usability. InnoDB provides the standard ACID database transaction properties, as well as declarative referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.