Varnish

Varnish Cache is a web application accelerator also called as a caching HTTP reverse proxy. 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 improve the speed of your web site. One of the essential pluses of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to specify how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the load speed of dynamic database-powered websites. It is used to lower 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 traffic-intensive sites on the World Wide Web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and efficient, perfect for high-performance content-rich apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the primary software component that a database management system uses to create, read, update and delete data from a database. Its latest edition features substantial improvements in performance, reliability and usability. InnoDB offers the standard ACID database transaction features, along with referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.