Varnish

Varnish Cache is a web accelerator also known as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will increase your website's speed. One of the chief merits 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 caching system for boosting the speed of dynamic database-powered websites. 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 memory object caching system uses a client/server architecture. The Memcached system is employed by some of the most popular sites on the web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, great for high-performance content-intensive network applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source relational database management system. A storage engine is the main software component that a database management system uses to create, read, update and delete data from a database. Its latest version offers serious improvements in performance, security and usability. InnoDB offers the standard ACID transaction properties, along with referential integrity support. It is included as standard in most binaries distributed by MySQL AB.