Varnish

Varnish Cache is a web accelerator also called as an HTTP accelerator. 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 speed up your web site. One of the main virtues of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which enables you to determine how incoming requests should be handled.

Memcached

Memcached is a general-purpose memory object caching system for boosting the load speed of dynamic database-driven websites. 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 memory caching system uses a two-tier architecture. The Memcached distributed memory caching system is used by some of the most popular websites on the World Wide Web and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and effective, excellent for real-time content-intensive 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 database engine is the main software component that a DBMS uses to create, retrieve, update and delete data from a database. Its latest edition offers considerable improvements in efficacy, security and usability. InnoDB offers the standard ACID database transaction attributes, along with declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.