Convert any document from and to any LibreOffice supported format

http://dag.wieers.com/home-made/unoconv/

Extract, view & test RAR archives

https://www.rarlab.com/

Lists/Extracts files from a "*.tgz" or "*.gz" archive

List, test, and extract compressed files from a ZIP archive

http://infozip.sourceforge.net/UnZip.html

Zoo archive extractor

http://freshmeat.sourceforge.net/projects/unzoo/

D-Bus daemon for simplifying power management tasks

http://upower.freedesktop.org/

APC Smart UPS Monitoring Daemon

Ultimate Packer for eXecutables

https://upx.github.io/

URI parsing library

https://github.com/uriparser/uriparser

URL extractor/launcher

https://github.com/sigpipe/urlview

Database of all known IDs used in USB devices

http://www.linux-usb.org/

Daemon for multiplexing connections over USB to iPhone/iPod Touch

http://www.libimobiledevice.org

UTF-8 processing library

https://juliastrings.github.io/utf8proc/

hash table for C structures

http://uthash.sourceforge.net/

Library for uu/xx/Base64/BinHex/yEnc de-/encoding

http://www.fpx.de/fp/Software/UUDeview/

Video4Linux IOCTL header files

https://linuxtv.org

Open source JavaScript engine by Google

https://v8.dev/

Programming language and compiler that converts Vala code into C code

https://wiki.gnome.org/Projects/Vala

Memory debugging and profiling tool

https://github.com/paulfloyd/freebsd_valgrind

Markup Validation Service from the World Wide Web Consortium (W3C)

http://validator.w3.org/

High-performance HTTP accelerator

http://www.varnish-cache.org/

Open source Gameboy Advance emulator

http://vba.ngemu.com/

GNU VCDImager/VCDRip -- The GNU VideoCD Image Maker/Ripping Tool

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

Graphical class browser for Xt

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

Web-based Version Control Repository Browsing

http://www.viewvc.org/

Improved version of the vi editor (tiny flavor)

https://www.vim.org/

VNC server that allows for remote access to your GNOME desktop

https://wiki.gnome.org/Projects/Vino

vitetris is a terminal-based Tetris clone by Victor Nilsson.

http://victornils.net/tetris/

Locks a terminal

http://freshmeat.net/projects/vlock

Management system for bhyve virtual machines

https://github.com/churchers/vm-bhyve

Captures a VNC desktop session and saves as a flv

http://www.unixuser.org/~euske/python/vnc2flv

Fast offline password cracker for VNC passwords

http://www.randombit.net/projects/vnccrack/

Multi-client VNC proxy server

https://sourceforge.net/projects/vnc-reflector/

Play, encode, and manage Ogg Vorbis files

https://xiph.org/vorbis/

Collection of scripts to setup routes and other changes for a VPN

http://git.infradead.org/users/dwmw2/vpnc-scripts.git

Verify mail address

https://github.com/asxe/vrfy/

Terminal widget with improved accessibility and I18N support

http://www.gnome.org/

Terminal widget with improved accessibility and I18N support

https://wiki.gnome.org/Apps/Terminal/VTE

Vulnerability and eXposure Markup Language DTD

https://vuxml.freebsd.org/

VuXML Query Tool

Command-line utilities for reading Veritas Filesystem (VxFS)

Pager/text-based WWW browser

http://w3m.sourceforge.net/

Simple FTP client for GNUstep

http://www.roard.com/waiho/

Audio codec for lossless, lossy, and hybrid compression

https://www.wavpack.com/

Wayland composite "server"

https://wayland.freedesktop.org/

Wayland protocols

https://wayland.freedesktop.org/

WINGs Display Manager; an xdm replacement

https://github.com/voins/wdm

Simple forking web benchmark

http://home.tiscali.cz/~cz210552/webbench.html

Port of Linux USB webcam and DVB drivers into userspace

http://www.selasky.org/hans_petter/video4bsd/

TrueType core fonts for the Web