Checks rc scripts for style and common errors

https://github.com/crees/rclint

Version control system (as was in FreeBSD prior to removal)

http://www.gnu.org/software/rcs/

RDP client for Windows NT/2000/2003 Terminal Server

http://www.rdesktop.org/

Lexer generator for C, C++ and Go with a focus on generating fast code

https://re2c.org/

Library for editing command lines as they are typed

https://tiswww.case.edu/php/chet/readline/rltop.html

RECORD extension headers

http://www.freedesktop.org/wiki/Software/xlibs

RenderProto protocol headers

https://www.freedesktop.org/wiki/Software/xlibs/

Resource extension headers

https://www.freedesktop.org/wiki/Software/xlibs/

A fast redirector and access controller for squid

http://www.bsdnexus.com/retsina/index.htm

Uncompile an rgb color-name database

https://gitlab.freedesktop.org/xorg/app/rgb

Fully skinnable XHTML/CSS webmail written in PHP

https://roundcube.net/

Convert .rpm files to cpio format

Restricted Secure SHell only for sftp or/and scp

http://www.pizzashack.org/rssh/index.shtml

Sample implementation of a Remote Start client

Network file distribution/synchronization utility

http://rsync.samba.org/

Kernel module which provides /dev/rtc device support

Low memory usage xterm replacement that supports color

Security Administrator's Integrated Network Tool

http://www.wwdsi.com/saint/

Shared lib from the samba package

http://www.samba.org/

NetBIOS Name lookup tool

http://www.samba.org/

nsupdate utility with the GSS-TSIG support

https://www.isc.org/software/bind

Samba "ftp-like" client

http://www.samba.org/

A free SMB and CIFS client and server for UNIX

http://www.samba.org/

SambaSentinel is a gtk-frontend to smbstatus with additional features

API for access to scanners, digitals camera, frame grabbers etc

http://www.sane-project.org/

Stand-Alone shell combining many common utilities

http://members.tip.net.au/~dbell/

Scan_ffs recovers lost disklabel

High-speed Dirac codec

http://www.diracvideo.org/

ANSI C version of the SciMark2 benchmark

https://math.nist.gov/scimark2/download_c.html

Build tool alternative to make

https://scons.org/

Tiny shell that only permits scp and sftp

https://github.com/scponly/scponly/wiki

Converts the output of "vidcontrol -p" to PNG

Converts the output of "vidcontrol -p" to text

Multi-screen window manager

http://www.gnu.org/software/screen/

Small and lightweight screen(1) wrapper

https://sourceforge.net/projects/screenie/

Various X related scripts

https://cgit.freedesktop.org/xorg/app/scripts

ScrnSaver extension headers

http://www.freedesktop.org/wiki/Software/xlibs

Open Document Cataloging Project

http://scrollkeeper.sourceforge.net/

Cross-platform multimedia development API

https://www.libsdl.org/

SDL graphics drawing primitives and other support functions

http://www.ferzkopp.net/Software/SDL_gfx-2.0/

Small sample cross-platform networking library

http://www.libsdl.org/projects/SDL_net/

Library to use TrueType fonts to render text in SDL applications

https://www.libsdl.org/projects/SDL_ttf/

"Simplified" DocBook XML DTD

http://www.oasis-open.org/docbook/xml/simple/

Extensive german HTML reference

http://www.selfhtml.org/

Manage utmp/wtmp entries for non-init X clients

Set the keyboard using the X Keyboard Extension

https://www.freedesktop.org/Software/xorg

Set of utilities that send SCSI commands to devices

http://sg.danny.cz/sg/sg3_utils.html

Generates groff and HTML from linuxdoc and docbook SGML documents

Interoperability between desktops and collaborative environments

http://oscaf.sourceforge.net

MIME types database from the freedesktop.org project

https://www.freedesktop.org/wiki/Software/shared-mime-info/