Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will improve your web site's speed. One of the essential virtues of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be handled.

Memcached

Memcached is a generic memory object caching system for boosting the loading speed of dynamic database-powered web sites. It is used to decrease 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 distributed memory object caching system is used by some of the most regularly visited web sites on the Internet and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, great for real-time data-rich network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source RDBMS. A storage engine is the main software component that a database management system uses to create, retrieve, update and delete data from a database. The latest release of InnoDB features serious improvements in efficiency, dependability and usability. InnoDB provides the standard ACID database transaction features, along with referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.