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 the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will make your site load much faster. One of the major virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic memory caching system for increasing the loading speed of dynamic database-driven sites. 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 caching system is used by some of the most frequently visited web sites on the Internet and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, great for real-time content-intensive network applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source RDBMS. A storage engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. The latest version of InnoDB features substantial improvements in efficiency, stability and functionality. InnoDB offers the standard ACID transaction features, along with foreign key support. It is included as standard in most binaries distributed by MySQL AB.