Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will improve the loading speed of your website. One of the key virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the load speed of dynamic database-powered sites. 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 system uses a client/server architecture. The Memcached distributed memory caching system is employed by some of the most popular websites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable Internet applications. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, excellent for real-time content-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A database engine is the main software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest edition offers serious improvements in efficiency, reliability and functionality. InnoDB provides the standard ACID-compliant database transaction properties, as well as declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.