Varnish

Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is very, very fast and will speed up your website. One of the chief attributes of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to specify how incoming requests should be tackled.

Memcached

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

Node.js

Node.js is a software system for building highly scalable network apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, perfect for real-time data-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 principal software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest version of InnoDB offers considerable improvements in performance, security and usability. InnoDB offers the standard ACID-compliant database transaction features, as well as referential integrity support. It is included by default in most binary distributions from MySQL AB.