Varnish

Varnish Cache is a web application accelerator also called 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 improve the loading speed of your website. One of the key pluses of Varnish Cache is the flexibility of its configuration language, VCL, which enables you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic memory object caching system for speeding up dynamic database-powered 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 caching system uses a two-tier architecture. The Memcached distributed memory object caching system is employed by some of the most frequently visited web sites on the web and is supported by popular 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, asynchronous I/O model that makes it lightweight and effective, great for real-time data-heavy Internet applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default database engine for the MySQL open-source relational database management system. A database engine is the underlying software component that a database management system uses to create, read, update and delete data from a database. Its latest version features substantial improvements in efficiency, dependability and usability. InnoDB provides the standard ACID transaction attributes, along with referential integrity support. InnoDB is included by default in most binaries distributed by MySQL AB.