Varnish

Varnish Cache is a web accelerator also popular as a caching HTTP reverse proxy. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is very, very fast and will improve your site's speed. One of the main advantages of Varnish Cache is the flexibility of its domain-specific language, VCL, which allows you to specify how incoming requests should be tackled.

Memcached

Memcached is a general-purpose 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 client'server architecture. The Memcached system is used by some of the most frequently visited sites on the Internet and is supported by famous CMSs 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 efficient, excellent for real-time content-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of 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 offers substantial improvements in efficacy, security and usability. InnoDB offers the standard ACID transaction properties, along with declarative referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.