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 the HTTP protocol and configure it to cache the content. Varnish Cache is very, very fast and will improve the loading speed of your site. One of the chief features of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory caching system for increasing the loading speed of dynamic database-driven 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 regularly visited websites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for building highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, ideal for real-time data-rich Internet 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 DBMS. A database engine is the underlying software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest release of InnoDB features significant improvements in performance, dependability and usability. InnoDB provides the standard ACID-compliant transaction features, along with referential integrity support. It is included as standard in most binaries distributed by MySQL AB.