Varnish

Varnish Cache is a web application accelerator also known as an HTTP accelerator. 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 really, really fast and will increase the loading speed of your website. One of the essential attributes of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to choose how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory caching system for speeding up 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 system uses a client/server architecture. The Memcached system is used by some of the most regularly visited web sites on the web and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and effective, perfect for real-time data-heavy applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source RDBMS. A storage engine is the primary software component that a database management system uses to create, retrieve, modify and delete data from a database. Its latest edition features significant improvements in efficacy, reliability and usability. InnoDB offers the standard ACID transaction features, as well as declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.