Varnish

Varnish Cache is a web application accelerator also famous 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 contents. Varnish Cache is really, really fast and will boost the loading speed of your site. One of the key pluses of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for increasing the speed of dynamic database-driven websites. It is used to reduce 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 client'server architecture. The Memcached system is used by some of the most traffic-hungry websites on the web and is supported by famous Content Management Systems 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 real-time data-rich 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 DBMS. 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 release offers considerable improvements in performance, security and functionality. InnoDB offers the standard ACID database transaction attributes, as well as declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.