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 HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will increase the loading speed of your site. One of the chief advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for increasing the loading speed of dynamic database-driven sites. It is used to reduce 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 web sites on the World Wide Web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, excellent for real-time data-intensive network applications. 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 RDBMS. A storage engine is the principal software component that a database management system uses to create, read, modify and delete data from a database. Its latest release features serious improvements in performance, security and functionality. InnoDB provides the standard ACID-compliant transaction features, as well as foreign key support. InnoDB is included as standard in most binary distributions from MySQL AB.