Varnish

Varnish Cache is a web application accelerator also popular as an HTTP accelerator. 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 boost your website's speed. One of the important features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for increasing the speed of dynamic database-powered web 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 distributed memory caching system uses a client/server architecture. The Memcached memory caching system is employed by some of the most popular sites on the World Wide Web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for building 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, suitable for real-time content-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source 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. Its latest version offers substantial improvements in efficiency, dependability and functionality. InnoDB offers the standard ACID-compliant database transaction properties, along with declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.