Varnish

Varnish Cache is a web application accelerator also popular 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 very, very fast and will improve your website's loading speed. One of the chief virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the load speed of dynamic database-powered websites. 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 distributed memory caching system is used by some of the most traffic-hungry sites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, great for real-time content-heavy applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A storage engine is the principal software component that a database management system uses to create, read, update and delete data from a database. The latest edition of InnoDB features considerable improvements in performance, reliability and usability. InnoDB offers the standard ACID-compliant transaction properties, as well as declarative referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.