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 HTTP and configure it to cache the content. Varnish Cache is very, very fast and will boost your web site's loading speed. One of the essential virtues of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory object caching system for increasing the load speed of dynamic database-powered web sites. It is used to lower 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 system uses a two-tier architecture. The Memcached system is used by some of the most popular websites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous input/output model that makes it lightweight and effective, perfect for real-time data-rich network apps. 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 database engine is the principal software component that a DBMS uses to create, read, update and delete data from a database. Its latest version features significant improvements in performance, dependability and functionality. InnoDB offers the standard ACID-compliant transaction features, along with referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.