Varnish

Varnish Cache is a web application accelerator also referred to 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 speed up your web site. One of the essential advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the load speed of dynamic database-driven 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 system uses a two-tier architecture. The Memcached memory caching system is employed by some of the most traffic-intensive sites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, great for real-time data-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the primary software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest release offers significant improvements in efficiency, reliability and usability. InnoDB provides the standard ACID database transaction attributes, along with foreign key support. It is included as standard in most binaries distributed by MySQL AB.