Varnish

Varnish Cache is a web accelerator also popular 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 very, very fast and will boost the loading speed of your website. One of the major strengths of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to determine how incoming requests should be tackled.

Memcached

Memcached is a general-purpose memory caching system for increasing the loading speed of dynamic database-powered 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 distributed memory object caching system uses a client'server architecture. The Memcached memory object caching system is used by some of the most popular sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, ideal for high-performance content-heavy apps. 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 relational database management system. A database engine is the primary software component that a DBMS uses to create, read, update and delete data from a database. Its latest edition features considerable improvements in efficacy, dependability and usability. InnoDB offers the standard ACID database transaction features, as well as referential integrity support. InnoDB is included as standard in most binary distributions from MySQL AB.