Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will increase the loading speed of your site. One of the chief attributes of Varnish Cache is the flexibility of its domain-specific language, VCL, which enables you to define how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory object caching system for boosting the speed of dynamic database-powered websites. 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 distributed memory caching system uses a two-tier architecture. The Memcached memory caching system is employed by some of the most traffic-intensive web sites on the Internet and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software system for building highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, asynchronous input/output model that makes it lightweight and efficient, great for high-performance content-rich network apps. 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 relational database management system. A storage engine is the primary software component that a DBMS uses to create, retrieve, modify and delete data from a database. The latest release of InnoDB features serious improvements in efficacy, dependability and usability. InnoDB provides the standard ACID database transaction attributes, along with referential integrity support. It is included as standard in most binary distributions from MySQL AB.