Varnish

Varnish Cache is a web accelerator also famous 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 really, really fast and will boost the speed of your site. One of the essential merits of Varnish Cache is the flexibility of its configuration language, VCL, which permits 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-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 caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most traffic-intensive sites on the World Wide Web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, suitable for real-time data-rich Internet 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 RDBMS. A database engine is the main software component that a database management system uses to create, retrieve, update and delete data from a database. The latest edition of InnoDB features significant improvements in performance, security and usability. InnoDB provides the standard ACID-compliant transaction properties, along with referential integrity support. It is included by default in most binaries distributed by MySQL AB.