Varnish

Varnish Cache is a web accelerator also referred to as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will improve your web site's loading speed. One of the important merits of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a generic memory object caching system for boosting the speed of dynamic database-powered 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 caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most traffic-hungry web sites on the World Wide Web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable network apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, suitable for real-time content-rich apps. 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 DBMS. A database engine is the primary software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest version of InnoDB features considerable improvements in efficacy, stability and functionality. InnoDB offers the standard ACID database transaction attributes, along with foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.