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 contents. Varnish Cache is really, really fast and will increase the speed of your web site. One of the major features of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to choose how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory caching system for increasing the loading speed of dynamic database-driven 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 client/server architecture. The Memcached memory caching system is employed 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 software platform for building scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and efficient, suitable for real-time data-heavy network 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 DBMS. A storage engine is the underlying software component that a DBMS uses to create, read, update and delete data from a database. Its latest release features significant improvements in efficiency, dependability and functionality. InnoDB provides the standard ACID-compliant transaction properties, as well as referential integrity support. It is included by default in most binary distributions from MySQL AB.