Varnish

Varnish Cache is a web accelerator also called as a caching HTTP reverse proxy. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will improve the speed of your web site. One of the important features of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to determine how incoming requests should be handled.

Memcached

Memcached is a generic memory object caching system for increasing the load 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 distributed memory object caching system uses a two-tier architecture. The Memcached memory caching system is used by some of the most traffic-hungry web sites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, excellent for real-time data-intensive network apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the primary software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release features serious improvements in efficacy, dependability and usability. InnoDB provides the standard ACID transaction properties, along with foreign key support. It is included by default in most binary distributions from MySQL AB.