Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. 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 boost the speed of your web site. One of the essential virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to choose how incoming requests should be tackled.

Memcached

Memcached is a generic memory object caching system for boosting 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 distributed memory object caching system uses a two-tier architecture. The Memcached system is employed by some of the most popular sites on the World Wide Web and is supported by famous 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, asynchronous I/O model that makes it lightweight and effective, ideal for real-time data-heavy network applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default storage 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 edition offers substantial improvements in efficacy, security and usability. InnoDB provides the standard ACID-compliant transaction features, along with foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.