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 the HTTP protocol 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 essential advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic memory object caching system for boosting the load speed of dynamic database-powered web sites. It is used to decrease 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 distributed memory object caching system uses a two-tier architecture. The Memcached distributed memory object caching system is employed by some of the most traffic-hungry web sites on the Internet and is supported by famous CMSs like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and efficient, excellent for real-time content-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 database engine is the primary software component that a DBMS uses to create, read, modify and delete data from a database. The latest edition of InnoDB features substantial improvements in performance, dependability and functionality. InnoDB provides the standard ACID database transaction attributes, as well as declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.