Varnish

Varnish Cache is a web accelerator also known 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 content. Varnish Cache is very, very fast and will boost the speed of your website. One of the essential merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory caching system for increasing the loading speed of dynamic database-powered 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 memory caching system uses a client/server architecture. The Memcached memory object caching system is employed by some of the most traffic-intensive sites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and efficient, suitable for real-time content-rich network applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage 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, update and delete data from a database. The latest edition of InnoDB offers considerable improvements in performance, dependability and functionality. InnoDB provides the standard ACID-compliant transaction features, along with referential integrity support. It is included by default in most binary distributions from MySQL AB.