Varnish

Varnish Cache is a web accelerator also called as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will increase the loading speed of your website. One of the chief merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for boosting the speed of dynamic database-powered web sites. It is used to decrease 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 object caching system uses a two-tier architecture. The Memcached memory object caching system is used by some of the most popular websites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, excellent for high-performance data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default database 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, modify and delete data from a database. The latest edition of InnoDB offers significant improvements in efficacy, stability and usability. InnoDB offers the standard ACID-compliant transaction properties, along with referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.