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 improve your web site's speed. One of the major features of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to define how incoming requests should be dealt with.

Memcached

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

Node.js

Node.js is a platform for building highly scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and effective, ideal for high-performance content-rich apps. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source DBMS. A database engine is the primary software component that a DBMS uses to create, read, update and delete data from a database. The latest edition of InnoDB offers considerable improvements in performance, security and functionality. InnoDB offers the standard ACID database transaction features, along with foreign key support. InnoDB is included as standard in most binaries distributed by MySQL AB.