retypar converts photos, drawings, etc. into text. The result can be saved as text, HTML, ANSI,or as an image (JPEG or GIF). You can influence the conversion by altering certain options (font, font size, scale factor, color etc.). This program is translated into German, English, French, Spanish, and Italian. In addition to the graphical interface, there is a batch mode that allows you to convert a number of pictures with a single command.
rgbproc-repository is intended for use with Xilinx EDK tools. It consists of many units written in VHDL that can be used to build a design for image/video processing. The backbone is the data bus (called simply RGB) that is used to pass data (typically) from VGA input to VGA/DVI output.
rgxg (ReGular eXpression Generator) is a C library and a command-line tool that generate (extended) regular expressions. It can be useful for generating expressions that match, for example, a specific number range (e.g. 0 to 31 or 00 to FF) or all addresses in a CIDR block (e.g. 192.168.0.0/24 or 2001:db8:aaaa::/64).
Rho is a small, very powerful console-based POSIX text editor and mini-IDE with Bash/Emacs key bindings. A configuration file allows the user to create macros using not only any internal function but anything available to a shell command. Keyboard macros (Ctl-Alt-A through Z) can be sourced into the editor for each kind of task, the next sourcing overwriting the last. Rho also allows an unlimited number of templates (sh, awk, python, etc.) to be injected into executable buffers which trap stdout and stderr.
Rig3 is a photo blog system that generates static HTML pages from a collection of pictures and text files. It uses the file system to dictate the structure. Each post can be an individual file, a directory with text and a list of images, or an Izumi blog entry. A wiki-like text syntax is supported. Monthly and index pages are generated along with an Atom feed per category. It can scale reasonably well for a moderate personal photo collection with tens of thousands of pictures.
rlimit is a program that lets you run processes with system resource limits set. It can be used by software developers and testers to test that software will run correctly in resource restricted environments. It is also useful for software which would otherwise consume excessive resources such as programs that used 100% CPU, set their own priority levels, or consume too much memory. This is basically a command line interface to the system functions getrlimit() and setrlimit().