R is a free software programming language and software environment for statistical computing and graphics. The R language is widely used among statisticians and data miners for developing statistical software and data analysis.

RabbitMQ is open source message broker software (sometimes called message-oriented middleware) that implements the Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Client libraries to interface with the broker are available for all major programming languages.

A computer dedicated to use as a server and designed to be installed in a framework called a rack. The rack contains multiple mounting slots called bays, each designed to hold a hardware unit secured in place with screws. 

An IT hosting company based in San Antonio, Texas, USA. They offer Security, Data Protection, Application, and Cloud services. Its clients include 40% of the members of the Fortune 100.

A type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies from 300 GHz to as low as 3 kHz. 

RadoGroup is a class used to create a multiple-exclusion scope for a set of radio buttons. Checking one radio button that belongs to a radio group unchecks any previously checked radio button within the same group.

An open source desktop customization tool thats allows you to customize skins for memory, battery power, RSS feeds etc.

A memory subsystem that promises to transfer up to 1.6 billion bytes per second. The subsystem consists of the RAM, the RAM controller, and the bus (path) connecting RAM to the microprocessor and devices in the computer that use it. 

The place in a computer where the operating system, application programs, and data in current use are kept so that they can be quickly reached by the computer's processor.

A type of malware used for data kidnapping, in which the attacker encrypts the victim's data and demands payment for the decryption key. The program can be installed from an e-mail attachment, an infected program, or a compromised or malicious Web site. 

A concept that products can be developed faster and of higher quality. RAD usually embraces object-oriented programming methodology, which inherently fosters software re-use. 

A.k.a 3-D printing, stereolighography, or architectural modeling, is a printing process that uses layers to create a 3D object. Prototypes created with 3-D printers can be produced very quickly and are durable enough to use in functional testing.

RAR is a proprietary archive file format that supports data compression, error recovery and file spanning. It was developed by a Russian software engineer, Eugene Roshal (the name RAR stands for Roshal ARchive) and the software is currently licensed by win.rar GmbH

The Raspberry Pi is a Credit Card sized single-board computer developed by the Raspberry Pi Foundationn. with an intention of promoting the teaching of basic computer science in schools. The Raspberry Pi is based on the Broadcom BCM2835 system on a chip (SoC), which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and was originally shipped with 256 megabytes of RAM, later upgraded (Model B & Model B+) to 512 MB. The system has Secure Digital (SD) or MicroSD (Model A+ and B+) sockets for boot media and persistent storage.

A hardware or combination hardware/software product that converts images described in the form of vector graphics statements into raster graphics images or bitmaps. 

Ratchet is an open-source front-end framework that helps you build highly interactive mobile web apps using simple and mobile-optimized HTML‚ CSS‚ and JavaScript components.