Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will boost the loading speed of your web site. One of the main advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for increasing the load speed of dynamic database-driven web sites. It is used to decrease 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 memory object caching system uses a client/server architecture. The Memcached system is employed by some of the most traffic-intensive web sites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, suitable for real-time content-intensive network 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 database management system. A storage engine is the main software component that a DBMS uses to create, read, update and delete data from a database. Its latest version offers serious improvements in efficacy, security and usability. InnoDB offers the standard ACID-compliant database transaction attributes, as well as referential integrity support. It is included as standard in most binary distributions from MySQL AB.