Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will boost the speed of your web site. One of the chief advantages of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to determine how incoming requests should be handled.

Memcached

Memcached is a generic 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 database or API) is read by caching data and objects in RAM. The Memcached memory object caching system uses a client/server architecture. The Memcached system is used by some of the most popular sites on the World Wide Web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and efficient, great for high-performance data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A storage engine is the principal software component that a DBMS uses to create, retrieve, update and delete data from a database. Its latest release offers significant improvements in performance, reliability and functionality. InnoDB provides the standard ACID transaction attributes, along with declarative referential integrity support. It is included by default in most binary distributions from MySQL AB.