High dynamic-range (HDR) image file format

https://github.com/AcademySoftwareFoundation/openexr/

Enterprise instant messaging server

https://www.igniterealtime.org/projects/openfire/index.jsp

Cisco implementation of H.264 codec

https://www.openh264.org/

Complex IPMI management software

http://openipmi.sourceforge.net/

Object-oriented SGML/XML parser toolkit and DSSSL engine

http://www.netfolder.com/DSSSL/

OpenJDK 11 FreeBSD binary

http://openjdk.java.net/

OpenJDK 7 FreeBSD binary

http://openjdk.java.net/

OpenJDK 8 FreeBSD binary

http://openjdk.java.net/

Open-source JPEG 2000 codec

https://www.openjpeg.org/

Open-source JPEG 2000 codec

https://www.openjpeg.org/

Open source LDAP client implementation

https://www.OpenLDAP.org/

Open source LDAP client implementation with SASL2 support

http://www.OpenLDAP.org/

Open source LDAP server implementation

https://www.OpenLDAP.org/

Open Multi-Processing runtime for LLVM/Clang

http://openmp.llvm.org/

High Performance Message Passing Library

http://www.open-mpi.org/

Software to control a multitude of (a)RGB devices

https://openrgb.org

Implementation of rsync with a BSD (ISC) license

https://github.com/kristapsdz/openrsync

Libraries and utilities to access smart cards

https://github.com/OpenSC/OpenSC/wiki

Full-text search engine for Java

http://opensearch.org

Open-source implementation of the Service Location Protocol

http://www.openslp.org/

This package is a collection of SGML/XML tools called OpenSP

http://openjade.sourceforge.net/doc/

Graphical password applet for entering SSH passphrase

http://www.jmknoble.net/software/x11-ssh-askpass/

The portable version of OpenBSD's OpenSSH

https://www.openssh.com/portable.html

TLSv1.3 capable SSL and crypto library

https://www.openssl.org/

UPS daemon for some Belkin UPS's

http://frmb.org/openupsd.html

Secure IP/Ethernet tunnel daemon

https://openvpn.net/community/

Optimizer for PNG files

http://optipng.sourceforge.net/

IETF audio codec

https://opus-codec.org/

Opus playback library

https://www.opus-codec.org/

Oracle 8 client

http://www.grosbein.net/freebsd/oracle/

Geometric sans-serif typeface intended for display purposes

https://github.com/theleagueof/orbitron

Library and toolset to operate arrays of data

https://gstreamer.freedesktop.org/projects/orc.html

Scriptable screen reader

http://live.gnome.org/Orca

Real-time Transport Protocol (RTP) library

https://www.linphone.org/technical-corner/ortp.html

Implementation of the UNIX 6th Edition shell

http://v6shell.org/

COIN-OR Open Solver Interface, an API for calling solver libraries

https://projects.coin-or.org/Osi/

Osinfo database files

https://libosinfo.org/

Tools for managing the osinfo database

https://libosinfo.org/

ISO-C API and CLI for generating Universally Unique Identifiers

http://www.ossp.org/pkg/lib/uuid/

OpenType Sanitizer

https://github.com/khaledhosny/ots

Plasma5 Oxygen font family

https://cgit.kde.org/oxygen-fonts.git

Library for loading and enumerating of PKCS#11 modules

http://p11-glue.freedesktop.org/p11-kit.html

Perforce client

https://www.perforce.com/

Module for merging hierarchies using the C3 algorithm

https://metacpan.org/release/Algorithm-C3

Perl interface to compute differences between two objects

https://metacpan.org/release/Algorithm-Diff

Detect and get configuration setting for SDL

https://metacpan.org/release/Alien-SDL

Perl extension for/to use Moose or Mouse modules

https://metacpan.org/release/Any-Moose

Provide framework for multiple event loops

https://metacpan.org/release/AnyEvent

Communicate with the i3 window manager

https://metacpan.org/release/AnyEvent-I3

Compile a log format string to perl-code

https://metacpan.org/release/Apache-LogFormat-Compiler