Varnish

Varnish Cache is a web application accelerator also popular 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 contents. Varnish Cache is very, very fast and will boost your web site's loading speed. One of the chief features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which permits you to determine how incoming requests should be handled.

Memcached

Memcached is a generic memory object caching system for boosting the speed of dynamic database-driven sites. It is used to decrease the number of times an external data source (such as a database or API) is read by caching data and objects in RAM. The Memcached distributed memory caching system uses a two-tier architecture. The Memcached memory object caching system is employed by some of the most regularly visited web sites on the World Wide Web and is supported by popular web applications like Joomla and WordPress.

Node.js

Node.js is a software platform for writing highly scalable network apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, great for high-performance content-heavy Internet apps. Node.js uses Google's V8 JavaScript engine, libUV, and several in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source DBMS. A storage engine is the main software component that a DBMS uses to create, read, update and delete data from a database. The latest version of InnoDB offers significant improvements in performance, security and usability. InnoDB offers the standard ACID database transaction properties, along with foreign key support. InnoDB is included by default in most binary distributions from MySQL AB.