Varnish

Varnish Cache is a web accelerator also known as a caching HTTP reverse proxy. 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 make your web site load much faster. One of the essential advantages 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 general-purpose distributed memory object caching system for boosting the loading speed of dynamic database-driven web sites. It is used to reduce 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 memory caching system uses a two-tier architecture. The Memcached distributed memory caching system is employed by some of the most traffic-hungry web sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, great for real-time data-intensive 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 RDBMS. A storage engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest version of InnoDB offers significant improvements in efficiency, reliability and functionality. InnoDB offers the standard ACID-compliant database transaction attributes, along with referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.