Varnish

Varnish Cache is a web accelerator also popular as an HTTP accelerator. You can install it in front of any server that speaks HTTP and configure it to cache the content. Varnish Cache is really, really fast and will make your site load much faster. One of the main advantages of Varnish Cache is the flexibility of its configuration language, VCL, which allows you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory caching system for boosting the loading speed of dynamic database-powered web 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 distributed memory object caching system uses a two-tier architecture. The Memcached memory object caching system is employed by some of the most frequently visited sites on the World Wide Web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable network applications. Built on Chrome's JavaScript runtime, Node.js uses an event-based, asynchronous I/O model that makes it lightweight and effective, great for high-performance data-rich Internet applications. 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 underlying software component that a database management system uses to create, retrieve, modify and delete data from a database. The latest edition of InnoDB features significant improvements in performance, reliability and functionality. InnoDB provides the standard ACID-compliant transaction properties, as well as foreign key support. InnoDB is included by default in most binaries distributed by MySQL AB.