Varnish

Varnish Cache is a web application accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will increase the speed of your website. One of the important advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to choose how incoming requests should be handled.

Memcached

Memcached is a generic memory caching system for increasing the load speed of dynamic database-driven web sites. 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 memory caching system uses a client'server architecture. The Memcached distributed memory caching system is used by some of the most frequently visited websites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network 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 high-performance content-heavy Internet applications. 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 database engine is the principal software component that a database management system uses to create, retrieve, update and delete data from a database. The latest version of InnoDB features significant improvements in efficacy, stability and functionality. InnoDB provides the standard ACID-compliant transaction attributes, along with foreign key support. InnoDB is included by default in most binaries distributed by MySQL AB.