Varnish

Varnish Cache is a web accelerator also known as an HTTP accelerator. 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 very, very fast and will boost the loading speed of your website. One of the chief strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for increasing the loading speed of dynamic database-driven websites. 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 distributed memory object caching system uses a client/server architecture. The Memcached distributed memory object 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 scalable network applications. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, excellent for high-performance content-heavy 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 database engine is the underlying software component that a DBMS uses to create, read, update and delete data from a database. Its latest release features significant improvements in efficacy, reliability and functionality. InnoDB offers the standard ACID-compliant database transaction features, along with declarative referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.