Varnish

Varnish Cache is a web application accelerator also famous 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 content. Varnish Cache is really, really fast and will increase your site's speed. One of the key virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to define how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose distributed memory object caching system for boosting 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 distributed memory object caching system uses a client'server architecture. The Memcached memory caching system is used by some of the most traffic-intensive web sites on the Internet and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and efficient, suitable for high-performance content-heavy network applications. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

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