Varnish

Varnish Cache is a web application accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will improve the speed of your website. One of the key pluses of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to define how incoming requests should be tackled.

Memcached

Memcached is a general-purpose distributed memory object caching system for increasing the loading speed of dynamic database-driven web 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 system uses a client'server architecture. The Memcached memory object caching system is used by some of the most frequently visited sites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable network applications. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, ideal for high-performance data-intensive network 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 database management system. A database engine is the underlying software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest version offers considerable improvements in efficacy, security and functionality. InnoDB provides the standard ACID-compliant transaction properties, along with referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.