Varnish

Varnish Cache is a web accelerator also famous as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will speed up your web site. One of the key merits of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to choose how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory object caching system for increasing the load 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 system uses a client'server architecture. The Memcached memory object caching system is employed by some of the most traffic-intensive websites on the World Wide Web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for building scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, ideal for real-time content-intensive 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 relational database management system. A database engine is the principal software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest version features considerable improvements in performance, stability and usability. InnoDB provides the standard ACID-compliant transaction features, as well as foreign key support. InnoDB is included by default in most binaries distributed by MySQL AB.