Varnish

Varnish Cache is a web accelerator also called as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will increase your web site's speed. One of the major strengths 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 distributed 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 DB or API) is read by caching data and objects in RAM. The Memcached memory caching system uses a client'server architecture. The Memcached system is employed by some of the most traffic-hungry sites on the Internet and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for building highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, great for real-time data-intensive network applications. 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 relational database management system. A storage engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest version offers considerable improvements in performance, dependability and usability. InnoDB offers the standard ACID-compliant database transaction attributes, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.