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().
rmlint is a command line tool to clean your filesystem from various sorts of lint, such as duplicates. It tends to be much faster than fdupes. Additionally, it is able to find empty files and directories, nonstripped binaries, files with the same basenames (nameclusters), old temporary data, strange filenames, and bad links.
rocknroll (Rsync fOr baCKup and Roll) is an incremental backup maker based on rsync. It backs up a remote directory tree to a destination directory on the local host. For this backup, it manages a set of archives named tag.1, tag.2, etc. Using the famous "link-dest" option of rsync, it keeps only the difference between the different archives.
rofldns is DNS server which is a fork of loldns, itself a fork of djbdns. It inherits all the good stuff from loldns, which includes multiple listening IPs, running as a service rather than under daemontools, and some other useful patches, but in addition builds under automake and trivially makes an RPM.
Rpmrestore allows the user to show the differences (user, group, mode, mtime, size) between a package's status on install and its current status. This act as an improvement of the functionality provided by the "rpm -V" command. It also allows the user to restore the attributes to their original state (install state). It features a batch mode, an interactive mode, a logfile, and rollback.