Varnish

Varnish Cache is a web application accelerator also popular as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will boost your web site's speed. One of the important strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to determine how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for boosting the loading speed of dynamic database-powered websites. It is used to reduce 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 system is used by some of the most traffic-heavy websites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for building highly scalable Internet applications. Written in JavaScript, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and efficient, perfect for high-performance data-rich network 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 relational database management system. A database engine is the principal software component that a database management system uses to create, read, modify and delete data from a database. The latest edition of InnoDB offers substantial improvements in efficacy, reliability and usability. InnoDB provides the standard ACID database transaction features, along with referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.