Varnish

Varnish Cache is a web application accelerator also famous as a caching HTTP reverse proxy. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the content. Varnish Cache is really, really fast and will boost your website's speed. One of the key advantages of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to specify how incoming requests should be dealt with.

Memcached

Memcached is a general-purpose memory object caching system for increasing the speed of dynamic database-driven sites. It is used to reduce 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 caching system uses a client'server architecture. The Memcached memory caching system is employed by some of the most regularly visited websites on the World Wide Web and is supported by popular web apps like Joomla and WordPress.

Node.js

Node.js is a platform for building scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, great for real-time content-intensive apps. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source database management system. A database engine is the underlying software component that a DBMS uses to create, read, modify and delete data from a database. The latest version of InnoDB offers considerable improvements in efficacy, dependability and functionality. InnoDB offers the standard ACID transaction properties, along with declarative referential integrity support. It is included as standard in most binaries distributed by MySQL AB.