Print formatter driven by XSL formatting

https://xmlgraphics.apache.org/fop/

Graphical front-end to the command-line BSD fortune

http://www.orange-carb.org/~csaldanh/software.html

Graph management system for GNUstep

http://FortyTwo.sourceforge.net/index.html

Interface to Berkeley DB for GNUstep

http://fortytwo.sourceforge.net/

Utility classes for GNUstep

http://fortytwo.sourceforge.net/

Flight of the Amazon Queen: a classic graphical adventure

http://www.scummvm.org

Make lines of the same color

https://wiki.gnome.org/Apps/Four-in-a-row

Free PHP class to generate PDF files with pure PHP

http://www.fpdf.org/

Quickly ping N hosts w/o flooding the network

http://www.fping.org/

The OpenAL Utility Toolkit

http://connect.creativelabs.com/openal/default.aspx

FreeBSD ftpd

https://github.com/cschuber/freebsd-ftpd

FreeBSD telnetd

https://github.com/cschuber/freebsd-telnet

Free turn-based multiplayer strategy

https://www.freeciv.org/

Free turn-based multiplayer strategy

https://www.freeciv.org/

Displays free memory as a bargraph

http://www.rkeene.org/oss/freecolor/

Sound theme based on the FreeDesktop specification

http://freedesktop.org/wiki/Specifications/sound-theme-spec

Free UCS Outline Fonts

http://www.nongnu.org/freefont/

Collection of ATM fonts (not all free) from the CICA archives

Open source implementation of the GLUT library

http://freeglut.sourceforge.net/

Free implementation of Remote Desktop Protocol

http://www.freerdp.com

TAR archiver for GNUstep

https://gna.org/projects/freetar/

Sybase/Microsoft TDS protocol library

http://www.freetds.org/

Free and portable TrueType font rendering engine

http://www.freetype.org/

Free and portable TrueType font rendering engine

https://www.freetype.org/

Library to extract valid data from within an Excel (.xls) spreadsheet

https://www.gaia-gis.it/fossil/freexl/index

Minimalistic plugin API for video effects

https://frei0r.dyne.org/

Free Implementation of the Unicode Bidirectional Algorithm

http://fribidi.org/

Freenet client that provides messenger and file services

http://jtcfrost.sourceforge.net/

Functional and object-oriented language for the .NET platform

http://fsharp.org/

List fonts served by the X font server

https://www.x.org/

Generate BDF font from X font server

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

Implementation of the Frame Streams data transport protocol in C

https://github.com/farsightsec/fstrm

OpenGL FreeType fonts rendering library

https://github.com/frankheckenbach/ftgl

Command line FTP tools for listing and mirroring

https://www.ohse.de/uwe/ftpcopy.html

Synchronizes a local and a remote FTP directory trees

http://www.clazzes.org/ftpsync

Utility to display the HTTP headers returned by web-servers

https://github.com/bingos/furl

Mount remote ftp directories

http://curlftpfs.sourceforge.net/

FUSE module to mount ext2, ext3 and ext4 with read write support

https://github.com/alperakcan/fuse-ext2

Mount PTP camera as a file system

http://gphoto.sourceforge.net/proj/gphotofs/

Fuse-based http filesystem

http://httpfs.sourceforge.net/

MTP device filesystem

https://github.com/kiorky/jmtpfs

FUSE allows filesystem implementation in userspace

https://github.com/libfuse/libfuse

FUSE library version 3 for filesystems implemented in userspace

https://github.com/libfuse/libfuse

Full-featured Linux BTRFS, Ext4, XFS as a FUSE module

https://github.com/lkl/linux/

Mount NTFS partitions (read/write) and disk images

http://www.tuxera.com/community/open-source-ntfs-3g/

FUSE-based file system backed by Amazon S3

https://github.com/s3fs-fuse/s3fs-fuse

Mount remote directories over ssh

https://github.com/libfuse/sshfs

FUSE based implementation of the well-known unionfs

https://github.com/rpodgorny/unionfs-fuse

Popular virtual window manager for X

https://www.fvwm.org/

Blazing fast command-line fuzzy finder

https://github.com/junegunn/fzf/