Varnish

Varnish Cache is a web accelerator also called as an HTTP accelerator. You can install it in front of any server that speaks the HTTP protocol and configure it to cache the contents. Varnish Cache is really, really fast and will increase your web site's loading speed. One of the main pluses of Varnish Cache is the flexibility of its domain-specific language, VCL, which permits you to define how incoming requests should be handled.

Memcached

Memcached is a generic distributed memory caching system for speeding up dynamic database-driven websites. It is used to lower 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 distributed memory object caching system uses a client'server architecture. The Memcached distributed memory caching system is used by some of the most regularly visited web sites on the World Wide Web and is supported by popular CMSs like Joomla and WordPress.

Node.js

Node.js is a platform for writing scalable Internet apps. Written in JavaScript, Node.js uses an event-based, non-blocking input/output model that makes it lightweight and efficient, excellent for high-performance data-rich network 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 DBMS uses to create, read, update and delete data from a database. Its latest version offers considerable improvements in efficiency, security and functionality. InnoDB provides the standard ACID-compliant transaction properties, along with declarative referential integrity support. It is included as standard in most binary distributions from MySQL AB.