Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will boost the loading speed of your site. One of the major features of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for boosting the loading speed of dynamic database-driven sites. It is used to lower 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 two-tier architecture. The Memcached distributed memory caching system is used by some of the most traffic-intensive 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 building scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, ideal for high-performance content-intensive Internet 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 relational database management system. A database engine is the main software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest version of InnoDB offers serious improvements in efficiency, security and functionality. InnoDB provides the standard ACID-compliant database transaction features, as well as declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.