Varnish

Varnish Cache is a web application accelerator also known as an HTTP accelerator. 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 boost your web site's speed. One of the important strengths of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to determine how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory 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 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 traffic-hungry web sites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, ideal for high-performance data-heavy network apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational 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 features considerable improvements in efficiency, dependability and usability. InnoDB provides the standard ACID transaction attributes, as well as referential integrity support. It is included by default in most binary distributions from MySQL AB.