Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will increase the loading speed of your website. One of the main merits of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to determine how incoming requests should be tackled.

Memcached

Memcached is a generic memory object caching system for boosting the load speed of dynamic database-driven web sites. It is used to lower 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 memory caching system uses a client/server architecture. The Memcached system is used by some of the most traffic-intensive websites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, ideal for high-performance data-intensive Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational database management system. A storage engine is the primary software component that a database management system uses to create, read, modify and delete data from a database. The latest edition of InnoDB features serious improvements in performance, stability and usability. InnoDB offers the standard ACID transaction features, along with foreign key support. InnoDB is included as standard in most binary distributions from MySQL AB.