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 very, very fast and will increase your site's speed. One of the important attributes of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits 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 web sites. It is used to reduce 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 caching system uses a client/server architecture. The Memcached memory caching system is used by some of the most regularly visited 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. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, perfect for real-time data-intensive applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the principal software component that a database management system uses to create, read, update and delete data from a database. Its latest release features significant improvements in efficacy, dependability and functionality. InnoDB provides the standard ACID transaction features, along with declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.