Varnish

Varnish Cache is a web application accelerator also popular as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will improve your web site's speed. One of the important pluses of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to choose how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting the speed of dynamic database-powered websites. 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 caching system uses a client/server architecture. The Memcached distributed memory caching system is employed 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, non-blocking input/output model that makes it lightweight and effective, great for high-performance data-rich Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in 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 database management system uses to create, retrieve, modify and delete data from a database. Its latest edition features serious improvements in performance, stability and functionality. InnoDB offers the standard ACID-compliant transaction features, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.