Varnish

Varnish Cache is a web application accelerator also popular 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 contents. Varnish Cache is really, really fast and will increase the loading speed of your site. One of the major virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to specify how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory caching system for increasing the load speed of dynamic database-powered websites. It is used to decrease 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 client'server architecture. The Memcached distributed memory object caching system is used by some of the most traffic-intensive websites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly 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 real-time content-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release features serious improvements in efficacy, stability and usability. InnoDB provides the standard ACID database transaction properties, along with referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.