Varnish

Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is very, very fast and will boost the speed of your web site. One of the key pluses of Varnish Cache is the flexibility of its principal configuration mechanism, VCL, which allows you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic distributed memory caching system for boosting 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 memory object caching system uses a client/server architecture. The Memcached distributed memory caching system is employed by some of the most frequently visited web sites on the Internet and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software platform for building highly scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking input/output model that makes it lightweight and efficient, suitable for high-performance data-intensive Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and several built-in libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source relational database management system. A database engine is the principal software component that a DBMS uses to create, read, modify and delete data from a database. Its latest release offers considerable improvements in efficacy, dependability and functionality. InnoDB provides the standard ACID-compliant database transaction properties, along with foreign key support. InnoDB is included by default in most binaries distributed by MySQL AB.