Varnish

Varnish Cache is a web application accelerator also called 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 content. Varnish Cache is really, really fast and will increase the speed of your web site. One of the key merits of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for boosting the load speed of dynamic database-powered web sites. It is used to decrease 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 distributed memory caching system uses a client'server architecture. The Memcached system is employed by some of the most regularly visited web sites on the Internet and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network apps. Written in JavaScript, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, ideal for real-time content-rich Internet applications. 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 storage engine is the underlying software component that a database management system uses to create, read, modify and delete data from a database. The latest version of InnoDB offers substantial improvements in efficacy, stability and functionality. InnoDB offers the standard ACID-compliant database transaction attributes, along with declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.