Varnish

Varnish Cache is a web accelerator also referred to as an HTTP accelerator. You can install it in front of any web server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will boost the speed of your web site. One of the essential merits 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 general-purpose distributed memory caching system for boosting the loading speed of dynamic database-powered sites. It is used to reduce 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 system uses a two-tier architecture. The Memcached memory object caching system is used by some of the most regularly visited web sites on the web and is supported by famous web applications like Joomla and WordPress.

Node.js

Node.js is a software system for writing scalable Internet applications. Built on Chrome's JavaScript runtime, Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and effective, great for real-time content-intensive 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 database management system. A storage engine is the underlying software component that a database management system uses to create, retrieve, update and delete data from a database. Its latest release offers considerable improvements in efficacy, security and functionality. InnoDB provides the standard ACID-compliant transaction properties, along with foreign key support. It is included by default in most binary distributions from MySQL AB.