Varnish

Varnish Cache is a web application accelerator also known 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 content. Varnish Cache is very, very fast and will improve the loading speed of your site. One of the main strengths of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to define how incoming requests should be handled.

Memcached

Memcached is a generic memory object caching system for increasing the loading speed of dynamic database-powered websites. It is used to decrease 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 system is used by some of the most regularly visited web sites on the Internet and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, great for real-time data-heavy 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 database management system. A storage engine is the primary software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest version offers serious improvements in efficiency, dependability and functionality. InnoDB provides the standard ACID-compliant transaction properties, as well as foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.