Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will increase the loading speed of your web site. One of the major advantages of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic memory caching system for increasing the load speed of dynamic database-driven sites. It is used to reduce 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 caching system uses a two-tier architecture. The Memcached distributed memory object caching system is used by some of the most traffic-heavy websites on the web and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, perfect for high-performance content-heavy 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 database engine is the primary software component that a database management system uses to create, read, modify and delete data from a database. The latest release of InnoDB features substantial improvements in efficiency, stability and functionality. InnoDB provides the standard ACID-compliant database transaction attributes, as well as referential integrity support. It is included as standard in most binary distributions from MySQL AB.