Varnish

Varnish Cache is a web application accelerator also referred to as a caching HTTP reverse proxy. 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 web site's loading speed. One of the chief attributes of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to determine how incoming requests should be dealt with.

Memcached

Memcached is a generic memory caching system for increasing the loading 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 employed by some of the most frequently visited sites on the World Wide Web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, perfect for high-performance data-heavy apps. 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 relational database management system. A database engine is the underlying software component that a database management system uses to create, read, update and delete data from a database. The latest version of InnoDB offers serious improvements in performance, security and usability. InnoDB offers the standard ACID transaction attributes, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.