Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will improve your site's loading speed. One of the key strengths of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to determine how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory caching system for speeding up 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 object caching system uses a client/server architecture. The Memcached distributed memory caching system is used by some of the most frequently visited websites on the World Wide Web and is supported by famous 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 effective, suitable for high-performance data-intensive apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A storage engine is the principal software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest edition offers considerable improvements in efficiency, dependability and functionality. InnoDB provides the standard ACID database transaction properties, along with foreign key support. It is included as standard in most binary distributions from MySQL AB.