Varnish

Varnish Cache is a web application accelerator also referred to as a caching HTTP reverse proxy. You can install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast and will make your web site load much faster. One of the chief pluses of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be dealt with.

Memcached

Memcached is a generic distributed memory caching system for increasing the load speed of dynamic database-powered web sites. It is used to decrease 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 memory object caching system is employed by some of the most traffic-intensive web sites on the Internet and is supported by famous Content Management Systems like Joomla and WordPress.

Node.js

Node.js is a software platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-driven, asynchronous I/O model that makes it lightweight and effective, suitable for high-performance data-intensive applications. Node.js uses Google's V8 JavaScript engine, libUV, and a number of in-built libraries.

InnoDB

InnoDB is the default storage engine for the MySQL open-source database management system. A database engine is the principal software component that a DBMS uses to create, retrieve, modify and delete data from a database. Its latest release offers substantial improvements in efficacy, dependability and usability. InnoDB provides the standard ACID transaction properties, along with referential integrity support. InnoDB is included by default in most binary distributions from MySQL AB.