Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will boost your website's loading speed. One of the main attributes of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory object caching system for speeding up dynamic database-powered sites. It is used to lower 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 system uses a client'server architecture. The Memcached memory caching system is employed by some of the most frequently visited websites on the World Wide Web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, suitable for high-performance data-heavy network apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A storage engine is the primary software component that a DBMS uses to create, retrieve, modify and delete data from a database. Its latest edition features considerable improvements in efficacy, dependability and functionality. InnoDB provides the standard ACID-compliant database transaction features, along with foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.