Varnish

Varnish Cache is a web 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 really, really fast and will boost the speed of your website. One of the key merits of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading speed of dynamic database-driven sites. It is used to reduce 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 system is employed by some of the most traffic-hungry web sites on the Internet and is supported by famous web applications like Joomla and WordPress.

Node.js

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

InnoDB

InnoDB is the default database 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, read, modify and delete data from a database. Its latest version offers considerable improvements in efficiency, reliability and usability. InnoDB offers the standard ACID-compliant database transaction properties, as well as declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.