Varnish

Varnish Cache is a web application accelerator also famous as an HTTP accelerator. You can install it in front of any web server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will boost the speed of your site. One of the essential advantages of Varnish Cache is the flexibility of its configuration language, VCL, which permits you to specify how incoming requests should be tackled.

Memcached

Memcached is a generic memory object caching system for increasing the load speed of dynamic database-driven web 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 memory object caching system uses a two-tier architecture. The Memcached system is employed by some of the most traffic-heavy web sites on the web and is supported by famous web apps like Joomla and WordPress.

Node.js

Node.js is a software system for building scalable Internet applications. Written in JavaScript, Node.js uses an event-based, non-blocking I/O model that makes it lightweight and efficient, great for real-time content-heavy apps. 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 database management system. 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 version of InnoDB features considerable improvements in efficacy, dependability and functionality. InnoDB provides the standard ACID database transaction features, along with referential integrity support. InnoDB is included as standard in most binaries distributed by MySQL AB.