Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. 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 speed up your web site. One of the chief pluses of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to choose how incoming requests should be handled.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the loading speed of dynamic database-driven 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 distributed memory object caching system uses a client/server architecture. The Memcached distributed memory object caching system is used by some of the most traffic-intensive sites on the World Wide Web and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a platform for building highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, excellent for high-performance content-heavy 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 DBMS. A database engine is the primary software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest release offers considerable improvements in efficiency, reliability and usability. InnoDB provides the standard ACID-compliant transaction properties, along with referential integrity support. It is included as standard in most binary distributions from MySQL AB.